Antisymmetric tensor: Difference between revisions

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In [[physics]], '''length scale''' is a particular [[length]] or [[distance]] determined with the precision of one order (or a few orders) of magnitude. The concept of length scale is particularly important because physical phenomena of different length scales cannot affect each other and are said to [[decoupling (physics)|decouple]].   The decoupling of different length scales makes it possible to have a self-consistent theory that only describes the relevant length scales for a given problem.   [[Scientific reductionism]] says that the physical laws on the shortest length scales can be used to derive the effective description at larger length scales. 
The idea that one can derive descriptions of physics at different length scales from one another can be quantified with the [[renormalization group]].
 
In [[quantum mechanics]] the length scale of a given phenomenon is related to its [[de Broglie wavelength]]
<math>\ell = \hbar/p</math> where <math>\hbar</math> is the reduced [[Planck's constant]] and <math>p</math> is the momentum that is being probed. In [[relativistic mechanics]] time and length scales are related by the [[speed of light]]. In [[relativistic quantum mechanics]] or [[relativistic quantum field theory]], length scales are related to momentum, time and energy scales through Planck's constant and the speed of light.   Often in [[high energy physics]] [[natural units]] are used where length, time, energy and momentum scales are described in the same units (usually with units of energy such as [[GeV]]).
 
Length scales are usually the operative scale (or at least one of the scales) in [[dimensional analysis]]. For instance, in [[scattering theory]], the most common quantity to calculate is a [[cross section (physics)|cross section]] which has units of length squared and is measured in [[barn (unit)|barn]]s. The cross section of a given process is usually the square of the length scale.
 
==Examples==
*The atomic length scale is <math>\ell_a \sim 10^{-10}</math> meters and is given by the size of hydrogen atom  (''i.e.'', the [[Bohr radius]] (approximately 53&nbsp;[[1 E-12 m|pm]])) which is set by the electron's [[Compton wavelength]] times the [[fine-structure constant]]: <math>\ell_{a} \sim 1/\alpha m_e</math>.
 
*The length scale for the [[strong interaction]]s (or the one derived from [[Quantum chromodynamics|QCD]] through [[dimensional transmutation]]) is around <math>\ell_{s}\sim 10^{-15}</math> meters (or in natural units 1000 MeV or 1 GeV), and the "radii" of strongly interacting particles (such as the [[proton]]) are roughly comparable.  This length scale is determined by the range of the [[Yukawa potential]].  The lifetimes of strongly interacting particles, such as the [[rho meson]], are  given by this length scale divided by the speed of light: <math>10^{-23}</math> seconds. The masses of strongly interacting particles are several times the associated energy scale (500 MeV to 3000 MeV).
 
*The [[electroweak]] length scale is shorter, roughly <math>\ell_{w} \sim 10^{-18}</math> meters and is set by the rest mass of the weak vector bosons which is roughly 100 GeV.  This length scale would be the distance where a Yukawa force is mediated by the weak vector bosons. The magnitude of weak length scale was initially inferred by the [[Fermi's interaction|Fermi constant]] measured by [[neutron]] and [[muon]] decay.
 
*The [[Planck length]] (Planck scale) is much shorter yet - about <math>\ell_{P}\sim 10^{-35}</math> meters (<math>10^{19}</math> GeV in natural units), and is derived from Newton's [[gravitational constant]] which has units of length squared.
 
*The [[Mesoscopic scale]] is the length at which quantum mechanical behaviours in liquids or solid can be described by [[macroscopic]] concepts.
 
==See also==
*[[Orders of magnitude (length)]]
*[[Extragalactic Distance Scale]]
*[[Scale height]]
 
{{DEFAULTSORT:Length Scale}}
[[Category:Concepts in physics]]
[[Category:Particle physics]]
[[Category:Renormalization group]]

Latest revision as of 06:03, 14 October 2014

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