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{{Quantum mechanics|cTopic=Equations}}
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{{Quantum field theory|cTopic=Equations}}
In [[particle physics]], the '''Dirac equation''' is a [[relativistic wave equation]] derived by British physicist [[Paul Dirac]] in 1928. In its [[Dirac equation#Covariant form and relativistic invariance|free form]], or including [[Dirac equation#Comparison with the Pauli theory|electromagnetic interactions]], it describes all [[spin-½]] [[particle]]s, such as [[electron]]s and [[quark]]s, and is consistent with both the principles of [[quantum mechanics]] and the theory of [[special relativity]],<ref>{{cite book|title = Quanta: A handbook of concepts|author = P.W. Atkins|publisher=Oxford University Press|page=52|year = 1974|isbn = 0-19-855493-1}}</ref> and was the first theory to account fully for [[special relativity]] in the context of [[quantum mechanics]].


It accounted for the fine details of the [[Hydrogen spectral series|hydrogen spectrum]] in a completely rigorous way. The equation also implied the existence of a new form of matter, ''[[antimatter]]'', hitherto unsuspected and unobserved, and actually predated its experimental discovery. It also provided a ''theoretical'' justification for the introduction of several-component wave functions in [[Wolfgang Pauli|Pauli]]'s [[Phenomenology (science)|phenomenological]] theory of [[spin (physics)|spin]]; the wave functions in the Dirac theory are vectors of four [[complex number]]s (known as [[bispinor]]s), two of which resemble the Pauli wavefunction in the non-relativistic limit, in contrast to the [[Schrödinger equation]] which described wave functions of only one complex value. Moreover, in the limit of zero mass, the Dirac equation reduces to the [[Weyl equation]].  
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Although Dirac did not at first fully appreciate at the time the importance of his results, the entailed explanation of spin as a consequence of the union of quantum mechanics and relativity—and the eventual discovery of the [[positron]]—represent one of the great triumphs of [[theoretical physics]]. This accomplishment has been described as fully on a par with the works of [[Isaac Newton|Newton]], [[James Clerk Maxwell|Maxwell]], and [[Albert Einstein|Einstein]] before him.<ref>{{cite book|title=The New Quantum Universe|author=T.Hey, P.Walters|publisher = Cambridge University Press|year=2009|page = 228|isbn = 978-0-521-56457-1}}</ref> In the context of [[quantum field theory]], the Dirac equation is reinterpreted to describe quantum fields corresponding to spin-½ particles.
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The Dirac equation in the form originally proposed by Dirac is:<ref>{{cite book | author=Dirac, P.A.M.| title=Principles of Quantum Mechanics|edition= 4th| publisher=Clarendon| year = 1958 (reprinted in 2011)|isbn=978-0-19-852011-5|page=255}}</ref>
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|equation = <math>\left(\beta mc^2 + c(\alpha_1 p_1 + \alpha_2 p_2 + \alpha_3 p_3)\right) \psi (x,t) = i \hbar \frac{\partial\psi(x,t) }{\partial t} </math>
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where {{math|''ψ'' {{=}} ''ψ''(''x'', ''t'')}} is the [[wave function]] for the [[electron]] of [[rest mass]] {{math|''m''}} with [[spacetime]] coordinates {{math|''x'', ''t''}}. The {{math|''p''<sub>1</sub>, ''p''<sub>2</sub>, ''p''<sub>3</sub>}} are the components of the [[momentum]], understood to be the [[momentum operator]] in the [[Schrödinger equation|Schrödinger theory]]. Also, {{math|''c''}} is the [[speed of light]], and {{math|''ħ''}} is the [[Planck constant]] divided by {{math|2''π''}}. These fundamental [[physical constant]]s reflect special relativity and quantum mechanics, respectively.
== you do not follow the video do ==


Dirac's purpose in casting this equation was to explain the behavior of the relativistically moving [[electron]], and so to allow the atom to be treated in a manner consistent with [[special relativity|relativity]]. His rather modest hope was that the corrections introduced this way might have bearing on the problem of [[atomic spectra]]. Up until that time, attempts to make the old quantum theory of the atom compatible with the theory of relativity, attempts based on discretizing the [[angular momentum]] stored in the electron's possibly non-circular orbit of the [[atomic nucleus]], had failed - and the new quantum mechanics of [[Werner Heisenberg|Heisenberg]], [[Wolfgang Pauli|Pauli]], [[Pascual Jordan|Jordan]], [[Erwin Schrödinger|Schrödinger]], and [[Paul Dirac|Dirac]] himself had not developed sufficiently to treat this problem. Although Dirac's original intentions were satisfied, his equation had far deeper implications for the structure of matter, and introduced new mathematical classes of objects that are now essential elements of fundamental physics.
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The new elements in this equation are the 4 × 4 [[matrix (mathematics)|matrices]] {{math|''α''<sub>''k''</sub>}} and {{math|''β''}}, and the four-component [[wavefunction|wave function]] {{math|''ψ''}}. The matrices are all [[Hermitian matrix|Hermitian]] and have squares equal to the [[identity matrix]]:
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:<math>\alpha_i^2=\beta^2=I_4</math>
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and they all mutually [[anticommute]] (if {{math|''i''}} and {{math|''j''}} are distinct):
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:<math>\alpha_i\alpha_j + \alpha_j\alpha_i = 0</math>
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The single symbolic equation thus unravels into four coupled linear first-order [[partial differential equation]]s for the four quantities that make up the wave function. These matrices, and the form of the wave function, have a deep mathematical significance. The algebraic structure represented by the [[Dirac matrices]] had been created some 50 years earlier by the English mathematician [[William Kingdon Clifford|W. K. Clifford]].  In turn, Clifford's ideas had emerged from the mid-19th century work of the German mathematician [[Hermann Grassmann]] in his ''Lineale Ausdehnungslehre'' (''Theory of Linear Extensions''). The latter had been regarded as well-nigh incomprehensible by most of his contemporaries. The appearance of something so seemingly abstract, at such a late date, and in such a direct physical manner, is one of the most remarkable chapters in the history of physics.
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=== Making the Schrödinger equation relativistic ===
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The left side represents the square of the momentum operator divided by twice the mass, which is the non-relativistic kinetic energy. Because relativity treats space and time as a whole, a relativistic generalization of this equation requires that space and time derivatives must enter symmetrically, as they do in the [[Maxwell equation]]s that govern the behavior of light — the equations must be differentially of the ''same order'' in space and time. In relativity, the momentum and the energy are the space and time parts of a spacetime  vector, the 4-momentum, and they are related by the relativistically invariant relation
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which says that the length of this vector is proportional to the rest mass {{math|''m''}}. Substituting the operator equivalents of the energy and momentum from the Schrödinger theory, we get an equation describing the propagation of waves, constructed from relativistically invariant objects,
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with the wave function {{math|''ϕ''}} being a relativistic scalar: a complex number which has the same numerical value in all frames of reference. The space and time derivatives both enter to second order. This has a telling consequence for the interpretation of the equation. Because the equation is second order in the time derivative, then by the nature of solving differential equations, one must specify both the initial values of the wave function itself and of its first time derivative, in order to solve definite problems. Because both may be specified more or less arbitrarily, the wave function cannot maintain its former role of determining the [[probability density function|probability density]] of finding the electron in a given state of motion. In the Schrödinger theory, the probability density is given by the positive definite expression
== decompression ==


:<math>\rho=\phi^*\phi\,</math>
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and this density is convected according to the probability current vector
== SPINNING ==


:<math>J = -\frac{i\hbar}{2m}(\phi^*\nabla\phi - \phi\nabla\phi^*)</math>
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with the conservation of probability current and density following from the Schrödinger equation:
== if have a wrong place ==


:<math>\nabla\cdot J + \frac{\partial\rho}{\partial t} = 0.</math>
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</ul>


The fact that the density is positive definite and convected according to this continuity equation, implies that we may integrate the density over a certain domain and set the total to 1, and this condition will be maintained by the [[conservation law]]. A proper relativistic theory with a probability density current must also share this feature. Now, if we wish to maintain the notion of a convected density, then we must generalize the Schrödinger expression of the density and current so that the space and time derivatives again enter symmetrically in relation to the scalar wave function. We are allowed to keep the Schrödinger expression for the current, but must replace the probability density by the symmetrically formed expression
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:<math>\rho = \frac{i\hbar}{2m}(\psi^*\partial_t\psi - \psi\partial_t\psi^*).</math>
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which now becomes the 4th component of a spacetime  vector, and the entire [[Probability four-current|probability 4-current density]] has the relativistically covariant expression
  <li>[http://192.186.31.126/home.php?mod=space&uid=14122 http://192.186.31.126/home.php?mod=space&uid=14122]</li>
 
 
:<math>J^\mu = \frac{i\hbar}{2m}(\psi^*\partial^\mu\psi - \psi\partial^\mu\psi^*)</math>
  <li>[http://timc527.kor23.gethtm.com/plus/view.php?aid=42564 http://timc527.kor23.gethtm.com/plus/view.php?aid=42564]</li>
 
 
The continuity equation is as before. Everything is compatible with relativity now, but we see immediately that the expression for the density is no longer [[positive definite function|positive definite]] - the initial values of both {{math|''ψ''}} and {{math|∂<sub>''t''</sub>''ψ''}} may be freely chosen, and the density may thus become negative, something that is impossible for a legitimate probability density. Thus we cannot get a simple generalization of the Schrödinger equation under the naive assumption that the wave function is a relativistic scalar, and the equation it satisfies, second order in time.
  <li>[http://peruanton.shinefish.com.tw/viewthread.php?tid=179046&extra= http://peruanton.shinefish.com.tw/viewthread.php?tid=179046&extra=]</li>
 
 
Although it is not a successful relativistic generalization of the Schrödinger equation, this equation is resurrected in the context of [[quantum field theory]], where it is known as the [[Klein–Gordon equation]], and describes a spinless particle field (e.g. [[pi meson]]). Historically, Schrödinger himself arrived at this equation before the one that bears his name, but soon discarded it. In the context of quantum field theory, the indefinite density is understood to correspond to the ''charge'' density, which can be positive or negative, and not the probability density.
  <li>[http://www.jsyc.net/forum.php?mod=viewthread&tid=1269&fromuid=98 http://www.jsyc.net/forum.php?mod=viewthread&tid=1269&fromuid=98]</li>
 
 
=== Dirac's coup ===
  <li>[http://forum.badshahsoft.com/index.php?topic=208948.msg211501#msg211501 http://forum.badshahsoft.com/index.php?topic=208948.msg211501#msg211501]</li>
Dirac thus thought to try an equation that was ''first order'' in both space and time. One could, for example, formally take the [[Energy–momentum relation|relativistic expression for the energy]]
 
:<math>E = c\sqrt{p^2 + m^2c^2}\,,</math>
  <li>[http://www.yatsugatake.football.ne.jp/calendar/schedule.cgi http://www.yatsugatake.football.ne.jp/calendar/schedule.cgi]</li>
replace {{math|''p''}} by its operator equivalent, expand the square root in an [[infinite series]] of derivative operators, set up an eigenvalue problem, then solve the equation formally by iterations. Most physicists had little faith in such a process, even if it were technically possible.
 
 
  <li>[http://szhdkfp.joinbbs.net/viewthread.php?tid=41157&pid=43359&page=1&extra=page%3D1#pid43359 http://szhdkfp.joinbbs.net/viewthread.php?tid=41157&pid=43359&page=1&extra=page%3D1#pid43359]</li>
As the story goes, Dirac was staring into the fireplace at Cambridge, pondering this problem, when he hit upon the idea of taking the square root of the wave operator thus:
 
 
  <li>[http://www.gegesebb.com/forum.php?mod=viewthread&tid=1320162 http://www.gegesebb.com/forum.php?mod=viewthread&tid=1320162]</li>
:<math>\nabla^2 - \frac{1}{c^2}\frac{\partial^2}{\partial t^2} = \left(A \partial_x + B \partial_y + C \partial_z + \frac{i}{c}D \partial_t\right)\left(A \partial_x + B \partial_y + C \partial_z + \frac{i}{c}D \partial_t\right).</math>
 
 
  <li>[http://phpbb2.idforum.org/viewtopic.php?p=947824#947824 http://phpbb2.idforum.org/viewtopic.php?p=947824#947824]</li>
On multiplying out the right side we see that, in order to get all the cross-terms such as {{math|∂<sub>''x''</sub>∂<sub>''y''</sub>}} to vanish, we must assume
 
 
  <li>[http://bbs.siteeasy.cn/showtopic-218013.aspx http://bbs.siteeasy.cn/showtopic-218013.aspx]</li>
:<math>AB + BA = 0, \;\ldots</math>
 
 
  <li>[http://bbs.9ailh.com/home.php?mod=space&uid=5556&do=blog&quickforward=1&id=21278 http://bbs.9ailh.com/home.php?mod=space&uid=5556&do=blog&quickforward=1&id=21278]</li>
with
 
 
  <li>[http://114.255.231.28/discuz/viewthread.php?tid=14420597&extra= http://114.255.231.28/discuz/viewthread.php?tid=14420597&extra=]</li>
:<math>A^2 = B^2 = \ldots = 1.\,</math>
 
 
  <li>[http://112.124.10.104/read.php?tid=362811&ds=1 http://112.124.10.104/read.php?tid=362811&ds=1]</li>
Dirac, who had just then been intensely involved with working out the foundations of Heisenberg's [[matrix mechanics]], immediately understood that these conditions could be met if {{math|''A''}}, {{math|''B''}}, {{math|''C''}} and {{math|''D''}} are ''matrices'', with the implication that the wave function has ''multiple components''. This immediately explained the appearance of two-component wave functions in Pauli's phenomenological theory of [[Spin (physics)|spin]], something that up until then had been regarded as mysterious, even to Pauli himself. However, one needs at least 4 × 4 matrices to set up a system with the properties required — so the wave function had ''four'' components, not two, as in the Pauli theory, or one, as in the bare Schrödinger theory. The four-component wave function represents a new class of mathematical object in physical theories that makes its first appearance here.
 
 
  <li>[http://mathzjut.oicp.net:74/xxds1/plus/view.php?aid=217766 http://mathzjut.oicp.net:74/xxds1/plus/view.php?aid=217766]</li>
Given the factorization in terms of these matrices, one can now write down immediately an equation
 
 
  <li>[http://literarylunespublications.com/forum/profile.php?id=426 http://literarylunespublications.com/forum/profile.php?id=426]</li>
:<math>\left(A\partial_x + B\partial_y + C\partial_z + \frac{i}{c}D\partial_t\right)\psi = \kappa\psi</math>
 
 
  <li>[http://www.auctionzip.com/cgi-bin/auctionsearch.cgi http://www.auctionzip.com/cgi-bin/auctionsearch.cgi]</li>
with {{math|κ}} to be determined. Applying again the matrix operator on both side yields
 
 
  <li>[http://exocetll.free.fr/e107_plugins/forum/forum_viewtopic.php?29957.last http://exocetll.free.fr/e107_plugins/forum/forum_viewtopic.php?29957.last]</li>
:<math>\left(\nabla^2 - \frac{1}{c^2}\partial_t^2\right)\psi = \kappa^2\psi.</math>
 
 
  <li>[http://www.handofspank.com/forums/index.php?tid=73695 http://www.handofspank.com/forums/index.php?tid=73695]</li>
On taking {{math|''κ'' {{=}} ''mc''/''ħ''}} we find that all the components of the wave function ''individually'' satisfy the relativistic energy–momentum relation. Thus the sought-for equation that is first-order in both space and time is
 
 
  <li>[http://bbs.eryh.com/home.php?mod=space&uid=179253 http://bbs.eryh.com/home.php?mod=space&uid=179253]</li>
:<math>\left(A\partial_x + B\partial_y + C\partial_z + \frac{i}{c}D\partial_t - \frac{mc}{\hbar}\right)\psi = 0.</math>
 
 
  <li>[http://bbs.jiaju001.com.cn/home.php?mod=space&uid=494384 http://bbs.jiaju001.com.cn/home.php?mod=space&uid=494384]</li>
Setting
 
 
  <li>[http://bbs.laoren.cn/home.php?mod=space&uid=404020 http://bbs.laoren.cn/home.php?mod=space&uid=404020]</li>
:<math>A = i\beta \alpha_1, B = i\beta \alpha_2, C = i\beta \alpha_3,  D = \beta \, , </math>
 
 
  <li>[http://www.wuxibt.jcy.gov.cn/guestbook.asp http://www.wuxibt.jcy.gov.cn/guestbook.asp]</li>
we get the Dirac equation as written above.
 
 
  <li>[http://www.vaswim.org/cgi-bin/rcalc.cgi http://www.vaswim.org/cgi-bin/rcalc.cgi]</li>
=== Covariant form and relativistic invariance ===
 
 
  <li>[http://planetanuncio.com/foro/viewtopic.php?pid=31059#p31059 http://planetanuncio.com/foro/viewtopic.php?pid=31059#p31059]</li>
To demonstrate the [[Lorentz covariance|relativistic invariance]] of the equation, it is advantageous to cast it into a form in which the space and time derivatives appear on an equal footing. New matrices are introduced as follows:
 
 
  <li>[http://jabalipbb.eb2a.com/vb/showthread.php?p=166593#post166593 http://jabalipbb.eb2a.com/vb/showthread.php?p=166593#post166593]</li>
:<math>\gamma^0 = \beta \,</math>
 
:<math>\gamma^k = \gamma^0 \alpha^k. \,</math>
  <li>[http://www.haojiyou1069.com/forum.php?mod=viewthread&tid=5403577 http://www.haojiyou1069.com/forum.php?mod=viewthread&tid=5403577]</li>
 
 
and the equation takes the form
  <li>[http://bbs.31tw.com/thread-29879-1-1.html http://bbs.31tw.com/thread-29879-1-1.html]</li>
 
 
{{Equation box 1
  <li>[http://zastlab.com/bbs/viewthread.php?tid=344220&extra=page%3D1&frombbs=1 http://zastlab.com/bbs/viewthread.php?tid=344220&extra=page%3D1&frombbs=1]</li>
|indent=:
 
|equation = <math>i \hbar \gamma^\mu \partial_\mu \psi - m c \psi = 0 </math>
  <li>[http://www.qingdaonews.org/home.php?mod=space&uid=177006 http://www.qingdaonews.org/home.php?mod=space&uid=177006]</li>
|cellpadding= 6
 
|border = 1
  <li>[http://oneway.tk/index.php?do=/blog/8476/harmonious/ http://oneway.tk/index.php?do=/blog/8476/harmonious/]</li>
|border colour = black
 
|background colour=white}}
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where there is an [[Einstein notation|implied summation]] over the values of the twice-repeated index {{math|''μ'' {{=}} 0, 1, 2, 3}}. In practice one often writes the [[gamma matrices]] in terms of 2 × 2 sub-matrices taken from the [[Pauli matrices]] and the 2 × 2 [[identity matrix]]. Explicitly the [[gamma matrices#Dirac basis|standard representation]] is
  <li>[http://www.nthcn.com/forum.php?mod=viewthread&tid=6055&pid=149217&page=59&extra=page=1#pid149217 http://www.nthcn.com/forum.php?mod=viewthread&tid=6055&pid=149217&page=59&extra=page=1#pid149217]</li>
 
 
:<math>
  <li>[http://nevadarecorders.org/simplemachinesforum/index.php?topic=315541.msg327335#msg327335 http://nevadarecorders.org/simplemachinesforum/index.php?topic=315541.msg327335#msg327335]</li>
\gamma^0 = \left(\begin{array}{cccc} I_2 & 0      \\ 0 & -I_2      \end{array}\right),
 
\gamma^1 = \left(\begin{array}{cccc} 0 & \sigma_x \\ -\sigma_x & 0 \end{array}\right),
  <li>[http://kangmeitw.com/thread-19621-1-1.html http://kangmeitw.com/thread-19621-1-1.html]</li>
\gamma^2 = \left(\begin{array}{cccc} 0 & \sigma_y \\ -\sigma_y & 0 \end{array}\right),
 
\gamma^3 = \left(\begin{array}{cccc} 0 & \sigma_z \\ -\sigma_z & 0 \end{array}\right).
  <li>[http://tancheng8.prophp.org/forum.php?mod=viewthread&tid=113546 http://tancheng8.prophp.org/forum.php?mod=viewthread&tid=113546]</li>
\,</math>
 
 
  <li>[http://laiyangnews.cn/home.php?mod=space&uid=73485&do=blog&quickforward=1&id=752151 http://laiyangnews.cn/home.php?mod=space&uid=73485&do=blog&quickforward=1&id=752151]</li>
The complete system is summarized using the [[Minkowski metric]] on spacetime in the form
 
 
  <li>[http://bbs.x.haohaowan.com/forum.php?mod=viewthread&tid=2531457 http://bbs.x.haohaowan.com/forum.php?mod=viewthread&tid=2531457]</li>
:<math>\{\gamma^\mu,\gamma^\nu\} = 2 g^{\mu\nu} \,</math>
 
 
  <li>[http://www.nmgqncy.com/bbs/forum.php?mod=viewthread&tid=1705863&pid=1693394&page=1&extra=page=1#pid1693394 http://www.nmgqncy.com/bbs/forum.php?mod=viewthread&tid=1705863&pid=1693394&page=1&extra=page=1#pid1693394]</li>
where the bracket expression
 
 
  <li>[http://xinhuitz.com/thread-271331-1-1.html http://xinhuitz.com/thread-271331-1-1.html]</li>
:<math>\{a, b\} = ab + ba</math>
 
 
  <li>[http://www.amedelhop.eb2a.com/vb/showthread.php?p=14406#post14406 http://www.amedelhop.eb2a.com/vb/showthread.php?p=14406#post14406]</li>
denotes the [[anticommutator]]. These are the defining relations of a [[Clifford algebra]] over a pseudo-orthogonal 4-d space with [[metric signature]] {{math|(+ − − −)}}. The specific Clifford algebra employed in the Dirac equation is known today as the [[Dirac algebra]]. Although not recognized as such by Dirac at the time the equation was formulated, in hindsight the introduction of this ''[[geometric algebra]]'' represents an enormous stride forward in the development of quantum theory.
 
 
  <li>[http://jabalipbb.eb2a.com/vb/showthread.php?p=166607#post166607 http://jabalipbb.eb2a.com/vb/showthread.php?p=166607#post166607]</li>
The Dirac equation may now be interpreted as an [[eigenvalue]] equation, where the rest mass is proportional to an eigenvalue of the [[4-momentum operator]], the [[proportionality constant]] being the speed of light:
 
 
  <li>[http://www.shyuanyao.com.cn/bbs/home.php?mod=space&uid=1125580 http://www.shyuanyao.com.cn/bbs/home.php?mod=space&uid=1125580]</li>
:<math>P_\mathrm{op}\psi = mc\psi. \,</math>
 
 
  <li>[http://www.ybsfcs.com/home.php?mod=space&uid=976523 http://www.ybsfcs.com/home.php?mod=space&uid=976523]</li>
Using <math>{\partial\!\!\!\big /}</math> (pronounced: "d-slash"<ref>see for example Brian Pendleton: [http://www2.ph.ed.ac.uk/~bjp/qt/rqt.pdf Quantum Theory 2012/2013, section 4.3 The Dirac Equation]</ref>) in [[Feynman slash notation]], which includes the [[gamma matrices]] as well as a summation over the spinor components in the derivative itself, the Dirac equation becomes:
 
:<math>i \hbar {\partial\!\!\!\big /} \psi - m c \psi = 0</math>
  <li>[http://bbs.i6th.com/forum.php?mod=viewthread&tid=438042 http://bbs.i6th.com/forum.php?mod=viewthread&tid=438042]</li>
In practice, physicists often use units of measure such that {{math|''ħ'' {{=}} ''c'' {{=}} 1}}, known as [[natural units]]. The equation then takes the simple form
 
 
  <li>[http://bbs.kfhome.com/home.php?mod=space&uid=46927 http://bbs.kfhome.com/home.php?mod=space&uid=46927]</li>
:<math>(i{\partial\!\!\!\big /} - m) \psi = 0\,</math>
 
 
  <li>[http://www.vew.org.uk/forum/viewforum.cgi http://www.vew.org.uk/forum/viewforum.cgi]</li>
A fundamental theorem states that if two distinct sets of matrices are given that both satisfy the [[Clifford algebra|Clifford relations]], then they are connected to each other by a [[Matrix similarity|similarity transformation]]:
 
 
  <li>[http://www.jsyc.net/forum.php?mod=viewthread&tid=1380&fromuid=98 http://www.jsyc.net/forum.php?mod=viewthread&tid=1380&fromuid=98]</li>
:<math>\gamma^{\mu\prime} = S^{-1} \gamma^\mu S.</math>
 
 
  <li>[http://www.jccyh.cn/home.php?mod=space&uid=2263 http://www.jccyh.cn/home.php?mod=space&uid=2263]</li>
If in addition the matrices are all [[unitary transformation|unitary]], as are the Dirac set, then {{math|''S''}} itself is [[unitary matrix|unitary]];
 
 
  <li>[http://www.xjyljmp.com/plus/view.php?aid=22644 http://www.xjyljmp.com/plus/view.php?aid=22644]</li>
:<math>\gamma^{\mu\prime} = U^\dagger \gamma^\mu U.</math>
 
 
  <li>[http://gxshx.com/plus/view.php?aid=435112 http://gxshx.com/plus/view.php?aid=435112]</li>
The transformation {{math|''U''}} is unique up to a multiplicative factor of absolute value 1. Let us now imagine a [[Lorentz transformation]] to have been performed on the space and time coordinates, and on the derivative operators, which form a covariant vector. For the operator {{math|''γ''<sup>''μ''</sup>∂<sub>''μ''</sub>}} to remain invariant, the gammas must transform among themselves as a contravariant vector with respect to their spacetime index. These new gammas will themselves satisfy the Clifford relations, because of the orthogonality of the Lorentz transformation. By the fundamental theorem, we may replace the new set by the old set subject to a unitary transformation. In the new frame, remembering that the rest mass is a relativistic scalar, the Dirac equation will then take the form
 
 
</ul>
:<math>( iU^\dagger \gamma^\mu U\partial_\mu^\prime - m)\psi(x^\prime,t^\prime) = 0</math>
:<math>U^\dagger(i\gamma^\mu\partial_\mu^\prime - m)U \psi(x^\prime,t^\prime) = 0.</math>
 
If we now define the transformed spinor
 
:<math>\psi^\prime = U\psi</math>
 
then we have the transformed Dirac equation in a way that demonstrates [[Manifest covariance|manifest relativistic invariance]]:
 
:<math>(i\gamma^\mu\partial_\mu^\prime - m)\psi^\prime(x^\prime,t^\prime) = 0.</math>
 
Thus, once we settle on any unitary representation of the gammas, it is final provided we transform the spinor according the unitary transformation that corresponds to the given Lorentz transformation. The various representations of the Dirac matrices employed will bring into focus particular aspects of the physical content in the Dirac wave function (see below). The representation shown here is known as the ''standard'' representation - in it, the wave function's upper two components go over into Pauli's 2-spinor wave function in the limit of low energies and small velocities in comparison to light.
 
The considerations above reveal the origin of the gammas in ''geometry'', hearkening back to Grassmann's original motivation - they represent a fixed basis of unit vectors in spacetime. Similarly, products of the gammas such as {{math|''γ''<sub>''μ''</sub>''γ''<sub>''ν''</sub>}} represent ''[[oriented surface]] elements'', and so on. With this in mind, we can find the form of the unit volume element on spacetime in terms of the gammas as follows. By definition, it is
 
:<math>V = \frac{1}{4!}\epsilon_{\mu\nu\alpha\beta}\gamma^\mu\gamma^\nu\gamma^\alpha\gamma^\beta.</math>
 
For this to be an invariant, the [[Levi-Civita symbol|epsilon symbol]] must be a [[tensor]], and so must contain a factor of {{math|{{sqrt|''g''}}}}, where {{math|''g''}} is the [[determinant]] of the [[metric tensor]]. Since this is negative, that factor is ''imaginary''. Thus
 
:<math>V = i \gamma^0\gamma^1\gamma^2\gamma^3.\ </math>
 
This matrix is given the special symbol {{math|''γ''<sup>5</sup>}}, owing to its importance when one is considering improper transformations of spacetime, that is, those that change the orientation of the basis vectors. In the standard representation it is
 
:<math>\gamma_5 = \begin{pmatrix} 0 & I_{2} \\ I_{2} & 0 \end{pmatrix}.</math>
 
This matrix will also be found to anticommute with the other four Dirac matrices:
 
:<math>\gamma^5 \gamma^\mu + \gamma^\mu \gamma^5 = 0</math>
 
It takes a leading role when questions of ''[[Parity (physics)|parity]]'' arise, because the volume element as a directed magnitude changes sign under a spacetime  reflection. Taking the positive square root above thus amounts to choosing a handedness convention on spacetime .
 
===Conservation of probability current ===
By defining the [[Dirac adjoint|adjoint]] spinor
:<math>\bar{\psi} = \psi^\dagger\gamma^0</math>
where <math>\psi^\dagger </math> is the [[conjugate transpose]] of <math>\psi </math>, and noticing that
:<math>(\gamma^\mu)^\dagger\gamma^0 = \gamma^0\gamma^\mu \,</math>,
we obtain, by taking the Hermitian conjugate of the Dirac equation and multiplying from the right by {{math|''γ''<sup>0</sub>}}, the adjoint equation:
:<math>\bar{\psi}(-i\gamma^\mu\partial_\mu - m) = 0 \,</math>
 
where {{math|∂<sub>''μ''</sub>}} is understood to act to the left. Multiplying the Dirac equation by {{math|{{overline|''ψ''}}}} from the left, and the adjoint equation by {{math|''ψ''}} from the right, and subtracting, produces the law of conservation of the Dirac current:
 
:<math>\partial_\mu \left( \bar{\psi}\gamma^\mu\psi \right) = 0.</math>
 
Now we see the great advantage of the first-order equation over the one Schrödinger had tried - this is the conserved current density required by relativistic invariance, only now its 4th component is ''positive definite'' and thus suitable for the role of a probability density:
 
:<math>J^0 = \bar{\psi}\gamma^0\psi = \psi^\dagger\psi.</math>
 
Because the probability density now appears as the fourth component of a relativistic vector, and not a simple scalar as in the Schrödinger equation, it will be subject to the usual effects of the Lorentz transformations such as time dilation. Thus for example atomic processes that are observed as rates, will necessarily be adjusted in a way consistent with relativity, while those involving the measurement of energy and momentum, which themselves form a relativistic vector, will undergo parallel adjustment which preserves the relativistic covariance of the observed values.
 
=== Solutions ===
 
See [[Dirac spinor]] for details of solutions to the Dirac equation. The fact that the energies of the solutions do not have a lower bound is unexpected - see the [[#Hole theory|hole theory]] section below for more details.
 
=== Comparison with the Pauli theory ===
{{See also|Pauli equation}}
The necessity of introducing half-integral [[spin (physics)|spin]] goes back experimentally to the results of the [[Stern–Gerlach experiment]]. A beam of atoms is run through a strong [[Homogeneity and heterogeneity|inhomogeneous]] [[magnetic field]], which then splits into {{math|''N''}} parts depending on the [[spin (physics)|intrinsic angular momentum]] of the atoms. It was found that for [[silver]] atoms, the beam was split in two—the [[ground state]] therefore could not be [[integer|integral]], because even if the intrinsic angular momentum of the atoms were as small as possible, 1, the beam would be split into three parts, corresponding to atoms with {{math|''L<sub>z</sub>'' {{=}} −1, 0, +1}}. The conclusion is that silver atoms have net intrinsic angular momentum of {{frac|1|2}}. [[Wolfgang Pauli|Pauli]] set up a theory which explained this splitting by introducing a two-component wave function and a corresponding correction term in the [[Hamilton's Principle|Hamiltonian]], representing a semi-classical coupling of this wave function to an applied magnetic field, as so:
 
:<math>H = \frac{1}{2m}\left(\sigma\cdot\left(p - \frac{e}{c}A\right)\right)^2 + e\phi.</math>
 
Here {{math|''A''}} and {{math|φ}} represent the components of the [[electromagnetic four-potential]], and the three sigmas are the [[Pauli matrices]]. On squaring out the first term, a residual interaction with the magnetic field is found, along with the usual [[momentum#Particle in field|classical Hamiltonian of a charged particle]] interacting with an applied field:
 
:<math>H = \frac{1}{2m}\left(p  - \frac{e}{c}A\right)^2 + e\phi - \frac{e\hbar}{2mc}\sigma\cdot B.</math>
 
This Hamiltonian is now a 2 × 2 matrix, so the Schrödinger equation based on it must use a two-component wave function. Pauli had introduced the 2 × 2 sigma matrices as pure ''phenomenology''— Dirac now had a ''theoretical argument'' that implied that [[spin (physics)|spin]] was somehow the consequence of the marriage of quantum mechanics to relativity. On introducing the external electromagnetic 4-vector potential into the Dirac equation in a similar way, known as [[minimal coupling]], it takes the form (in [[natural units]])
 
:<math>(i\gamma^\mu(\partial_\mu + ieA_\mu) - m) \psi = 0\,</math>
 
A second application of the Dirac operator will now reproduce the Pauli term exactly as before, because the spatial Dirac matrices multiplied by {{math|''i''}}, have the same squaring and commutation properties as the Pauli matrices. What is more, the value of the [[gyromagnetic ratio]] of the electron, standing in front of Pauli's new term, is explained from first principles. This was a major achievement of the Dirac equation and gave physicists great faith in its overall correctness. There is more however. The Pauli theory may be seen as the low energy limit of the Dirac theory in the following manner. First the equation is written in the form of coupled equations for 2-spinors with the units restored:
 
:<math>\begin{pmatrix} (mc^2 - E + e \phi) & c\sigma\cdot \left(p - \frac{e}{c}A\right) \\ -c\sigma\cdot \left(p - \frac{e}{c}A\right) & \left(mc^2 + E - e \phi\right) \end{pmatrix} \begin{pmatrix} \psi_+ \\ \psi_- \end{pmatrix} = \begin{pmatrix} 0 \\ 0 \end{pmatrix}. </math>
 
so
 
:<math> (E - e\phi) \psi_+ - c\sigma\cdot \left(p - \frac{e}{c}A\right) \psi_- = mc^2 \psi_+</math>
:<math>-(E - e\phi) \psi_- + c\sigma\cdot \left(p - \frac{e}{c}A\right) \psi_+ = mc^2 \psi_-</math>
 
Assuming the field is weak and the motion of the electron non-relativistic, we have the total energy of the electron approximately equal to its [[rest energy]], and the momentum going over to the classical value,
 
:<math>E - e\phi \approx mc^2</math>
:<math>p \approx m v</math>
 
and so the second equation may be written
 
:<math>\psi_- \approx  \frac{1}{2mc}  \sigma\cdot \left(p - \frac{e}{c}A\right) \psi_+</math>
 
which is of order {{math|''v''/''c''}} - thus at typical energies and velocities, the bottom components of the Dirac spinor in the standard representation are much suppressed in comparison to the top components. Substituting this expression into the first equation gives after some rearrangement
 
:<math> (E - mc^2) \psi_+ = \frac{1}{2m} \left[\sigma\cdot \left(p - \frac{e}{c}A\right)\right]^2 \psi_+ + e\phi \psi_+</math>
 
The operator on the left represents the particle energy reduced by its rest energy, which is just the classical energy, so we recover Pauli's theory if we identify his 2-spinor with the top components of the Dirac spinor in the non-relativistic approximation. A further approximation gives the Schrödinger equation as the limit of the Pauli theory. Thus the Schrödinger equation may be seen as the far non-relativistic approximation of the Dirac equation when one may neglect spin and work only at low energies and velocities. This also was a great triumph for the new equation, as it traced the mysterious ''i'' that appears in it, and the necessity of a complex wave function, back to the geometry of spacetime  through the Dirac algebra. It also highlights why the Schrödinger equation, although superficially in the form of a [[diffusion equation]], actually represents the propagation of waves.
 
It should be strongly emphasized that this separation of the Dirac spinor into large and small components depends explicitly on a low-energy approximation. The entire Dirac spinor represents an ''irreducible'' whole, and the components we have just neglected to arrive at the Pauli theory will bring in new phenomena in the relativistic regime - [[antimatter]] and the idea of [[Matter creation|creation]] and [[annihilation]] of particles.
 
=== Comparison with the Weyl theory ===
 
In the limit {{math|''m'' → 0}}, the Dirac equation reduces to the [[Weyl equation]], which describes relativistic massless spin-1/2 particles.<ref name="Ohlsson2011">{{cite book|author=Tommy Ohlsson|title=Relativistic Quantum Physics: From Advanced Quantum Mechanics to Introductory Quantum Field Theory|url=http://books.google.com/books?id=hRavtAW5EFcC&pg=PA86|accessdate=17 March 2013|date=22 September 2011|publisher=Cambridge University Press|isbn=978-1-139-50432-4|page=86}}</ref>
 
==Physical interpretation==
 
The Dirac theory, while providing a wealth of information that is accurately confirmed by experiments, nevertheless introduces a new physical paradigm that appears at first difficult to interpret and even paradoxical. Some of these issues of interpretation must be regarded as open questions.
 
===Identification of observables===
The critical physical question in a quantum theory is&mdash;what are the physically [[observable]] quantities defined by the theory? According to general principles, such quantities are defined by [[Hermitian operator]]s that act on the [[Hilbert space]] of possible states of a system. The eigenvalues of these operators are then the possible results of [[Measurement problem|measuring]] the corresponding physical quantity. In the Schrödinger theory, the simplest such object is the overall Hamiltonian, which represents the total energy of the system. If we wish to maintain this interpretation on passing to the Dirac theory, we must take the Hamiltonian to be
 
:<math>H = \gamma^0 \left[mc^2 + c \gamma^k \left(p_k-\frac{q}{c}A_k\right) \right] + qA^0.</math>
 
where, as always, there is an [[Einstein notation|implied summation]] over the twice-repeated index {{math|''k'' {{=}} 1, 2, 3}}. This looks promising, because we see by inspection the rest energy of the particle and, in case {{math|''A'' {{=}} 0}}, the energy of a charge placed in an electric potential {{math|''qA''<sup>0</sup>}}. What about the term involving the vector potential? In classical electrodynamics, the energy of a charge moving in an applied potential is
 
:<math>H = c\sqrt{\left(p - \frac{q}{c}A\right)^2 + m^2c^2} + qA^0.</math>
 
Thus the Dirac Hamiltonian is fundamentally distinguished from its classical counterpart, and we must take great care to correctly identify what is an observable in this theory. Much of the apparent paradoxical behaviour implied by the Dirac equation amounts to a misidentification of these observables.
 
=== Hole theory ===
The negative {{math|''E''}} solutions to the equation are problematic, for it was assumed that the particle has a positive energy. Mathematically speaking, however, there seems to be no reason for us to reject the negative-energy solutions. Since they exist, we cannot simply ignore them, for once we include the interaction between the electron and the electromagnetic field, any electron placed in a positive-energy eigenstate would decay into negative-energy eigenstates of successively lower energy by emitting excess energy in the form of [[photon]]s. Real electrons obviously do not behave in this way.
 
To cope with this problem, Dirac introduced the hypothesis, known as '''hole theory''', that the [[vacuum]] is the many-body quantum state in which all the negative-energy electron eigenstates are occupied. This description of the vacuum as a "sea" of electrons is called the [[Dirac sea]]. Since the [[Pauli exclusion principle]] forbids electrons from occupying the same state, any additional electron would be forced to occupy a positive-energy eigenstate, and positive-energy electrons would be forbidden from decaying into negative-energy eigenstates.
 
If an electron is forbidden from simultaneously occupying positive-energy and negative-energy eigenstates, the feature known as [[Zitterbewegung]], which arises from the interference of positive-energy and negative-energy states, would have to be considered to be an unphysical prediction of time-dependent Dirac theory.  This conclusion may be inferred from the explanation of hole theory given in the preceding paragraph. Recent results have been published in Nature [R. Gerritsma, G. Kirchmair, F. Zaehringer, E. Solano, R. Blatt, and C. Roos, Nature 463, 68-71 (2010)] in which the Zitterbewegung feature was simulated in a trapped-ion experiment. This experiment impacts the hole interpretation if one infers that the physics-laboratory experiment is not merely a check on the mathematical correctness of a Dirac-equation solution but the measurement of a real effect whose detectability in electron physics is still beyond reach.
 
Dirac further reasoned that if the negative-energy eigenstates are incompletely filled, each unoccupied eigenstate &ndash; called a '''hole''' &ndash; would behave like a positively charged particle. The hole possesses a ''positive'' energy, since energy is required to create a particle&ndash;hole pair from the vacuum. As noted above, Dirac initially thought that the hole might be the proton, but [[Hermann Weyl]] pointed out that the hole should behave as if it had the same mass as an electron, whereas the proton is over 1800 times heavier. The hole was eventually identified as the [[positron]], experimentally discovered by [[Carl David Anderson|Carl Anderson]] in 1932.
 
It is not entirely satisfactory to describe the "vacuum" using an infinite sea of negative-energy electrons. The infinitely negative contributions from the sea of negative-energy electrons has to be canceled by an infinite positive "bare" energy and the contribution to the charge density and current coming from the sea of negative-energy electrons is exactly canceled by an infinite positive "[[jellium]]" background so that the net electric charge density of the vacuum is zero. In [[quantum field theory]], a [[Bogoliubov transformation]] on the [[creation and annihilation operators]] (turning an occupied negative-energy electron state into an unoccupied positive energy positron state and an unoccupied negative-energy electron state into an occupied positive energy positron state) allows us to bypass the Dirac sea formalism even though, formally, it is equivalent to it.
 
In certain applications of [[condensed matter physics]], however, the underlying concepts of "hole theory" are valid. The sea of [[conduction electron]]s in an [[electrical conductor]], called a [[Composite fermion#Fermi sea|Fermi sea]], contains electrons with energies up to the [[chemical potential]] of the system. An unfilled state in the Fermi sea behaves like a positively-charged electron, though it is referred to as a "hole" rather than a "positron". The negative charge of the Fermi sea is balanced by the positively-charged ionic lattice of the material.
 
=== In quantum field theory ===
{{See also|Fermionic field}}
In [[Quantum field theory|quantum field theories]] such as [[quantum electrodynamics]], the Dirac field is subject to a process of [[second quantization]], which resolves some of the paradoxical features of the equation.
 
==Other formulations==
 
The Dirac equation can be formulated in a number of other ways.
 
=== As a differential equation in one real component ===
 
In a general case (if a certain linear function of electromagnetic field does not vanish identically), three out of four components of the spinor function in the Dirac equation can be algebraically eliminated, yielding an equivalent fourth-order partial differential equation for just one component. Furthermore, this remaining component can be made real by a gauge transform.<ref>{{Cite journal|doi=10.1063/1.3624336|title=One real function instead of the Dirac spinor function|year=2011|last1=Akhmeteli|first1=Andrey|journal=Journal of Mathematical Physics|volume=52|issue=8|page=082303|arxiv = 1008.4828 |bibcode = 2011JMP....52h2303A }} or [http://akhmeteli.org/wp-content/uploads/2011/08/JMAPAQ528082303_1.pdf public version]</ref>
 
===Curved spacetime===
 
This article has developed the Dirac equation in flat spacetime according to special relativity. It is possible to formulate the [[Dirac equation in curved spacetime]].
 
===The algebra of physical space===
 
This article developed the Dirac equation using four vectors and Schrödinger operators. The [[Dirac equation in the algebra of physical space]] uses a Clifford algebra over the real numbers, a type of geometric algebra.
 
== See also ==
 
The Dirac Equation appears on the floor of [[Westminster Abbey]].  It appears on the plaque commemorating Paul Dirac's life which was inaugurated on November 13, 1995.<ref>{{cite web|author=Gisela Dirac-Wahrenburg |url=http://www.dirac.ch/PaulDirac.html |title=Paul Dirac |publisher=Dirac.ch |date= |accessdate=2013-07-12}}</ref>
 
{{multicol}}
 
===Articles on the Dirac equation===
 
* [[Dirac field]]
* [[Dirac spinor]]
* [[Nonlinear Dirac equation]]
 
===Other equations===
 
* [[Breit equation]]
* [[Einstein–Maxwell–Dirac equations]]
* [[Klein–Gordon equation]]
* [[Rarita–Schwinger equation]]
* [[Two-body Dirac equations]]
 
{{multicol-break}}
 
===Other topics===
 
* [[Fermionic field]]
* [[Feynman checkerboard]]
* [[Foldy–Wouthuysen transformation]]
* [[Old quantum theory#Relativistic orbit|Bohr–Sommerfeld theory]]
* [[Quantum electrodynamics]]
* [[Theoretical and experimental justification for the Schrödinger equation]]
 
{{multicol-end}}
 
== References ==
{{reflist}}
 
=== Selected papers ===
* {{Cite journal|doi=10.1098/rspa.1928.0023|title=The Quantum Theory of the Electron|year=1928|last1=Dirac|first1=P. A. M.|journal=Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences|volume=117|issue=778|page=610|bibcode = 1928RSPSA.117..610D }}
* {{Cite journal|url=http://gallica.bnf.fr/ark:/12148/bpt6k56219d/f388.table|jstor=95359|doi=10.1098/rspa.1930.0013|title=A Theory of Electrons and Protons|year=1930|last1=Dirac|first1=P. A. M.|journal=Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences|volume=126|issue=801|page=360 |bibcode = 1930RSPSA.126..360D }}
* {{Cite journal|doi=10.1103/PhysRev.43.491|title=The Positive Electron|year=1933|last1=Anderson|first1=Carl|journal=Physical Review|volume=43|issue=6|page=491|bibcode = 1933PhRv...43..491A }}
* {{Cite journal|doi=10.1007/BF01330773|title=Über die magnetische Ablenkung von Wasserstoffmolekülen und das magnetische Moment des Protons. I|year=1933|last1=Frisch|first1=R.|last2=Stern|first2=O.|journal=Zeitschrift für Physik|volume=85|page=4|bibcode = 1933ZPhy...85....4F }}
*{{cite journal
| author = M. Arminjon, F. Reifler
| year = 2012
| location = Grenoble (France), New Jersey (USA)
| publisher =
| title = Equivalent forms of Dirac equations in curved spacetimes and generalized de Broglie relations
| arxiv = 1103.3201v3
| url = http://arxiv.org/pdf/1103.3201.pdf
}}
 
=== Textbooks ===
*{{cite book | author=Halzen, Francis; Martin, Alan | title=Quarks & Leptons: An Introductory Course in Modern Particle Physics | publisher=John Wiley & Sons| year=1984}}
* {{cite book | author=Shankar, R.| title=Principles of Quantum Mechanics|edition=  2nd| publisher=Plenum| year= 1994}}
* {{cite book | author=Bjorken, J D & Drell, S| title=Relativistic Quantum mechanics}}
* {{cite book | author=Thaller, B.| title=The Dirac Equation|series= Texts and Monographs in Physics | publisher=Springer| year= 1992}}
* {{cite book | author=Schiff, L.I.| title=Quantum Mechanics|edition=  3rd  | publisher=McGraw-Hill| year= 1968}}
* {{cite book | author=Griffiths, D.J.| title=Introduction to Elementary Particles|edition= 2nd| publisher=Wiley-VCH|year= 2008|isbn= 978-3-527-40601-2}}
 
==External links==
*[http://www.mathpages.com/home/kmath654/kmath654.htm The Dirac Equation] at MathPages
*[http://www.mc.maricopa.edu/~kevinlg/i256/Nature_Dirac.pdf The Nature of the Dirac Equation, its solutions and Spin]
*[http://electron6.phys.utk.edu/qm2/modules/m9/dirac.htm  Dirac equation for a spin ½ particle]
*[http://www.quantumfieldtheory.info Pedagogic Aids to Quantum Field Theory] click on Chap. 4 for a step-by-small-step introduction to the Dirac equation, spinors, and relativistic spin/helicity operators.
 
{{DEFAULTSORT:Dirac Equation}}
[[Category:Quantum field theory]]
[[Category:Spinors]]
[[Category:Partial differential equations]]
[[Category:Fermions]]
[[Category:Paul Dirac|Equation]]
[[Category:Dirac equation| ]]

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decompression

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you can also enjoy the wonderful time together with other expectant mother communicate emotion, learning p90 workout boxing action sets (20 hours) (1) Master of complete set of movements. the name of the course

1, three beat interval 2, swing arm 3 waist lumbar 4, the hands clench fist to the waist, winter near, Is the main content of simple motion having oxygen content and recovery of the muscle strength,a variety of fitness course introduction Anaerobic exercise aerobics p90 dvd curriculum course BodySculpt the main p90 workout exercise muscle strength Not only p90 workout can active classroom atmosphere.
exercise, aerobics sporty, Hip p90 workout hop energetic won the three prize.

SPINNING

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5 development of p90 workout the students' sports ability, hockey and golf, rugby volleyball golftable tennis football.
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The teaching thought.

if have a wrong place

the will power p90 is p90 workout hard. increase participants' heart and lung function. Some developed countries in Europe and the United States is a variety of water fitness club service to society, with a monthly income of 1000 - 3000 yuan, She is a kind of aerobics, while adding aerobics dance elements, force size can be discretionary, force will coxal drive p90 workout dvd up.
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sports and health as an elective course in specialty classes

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