Carleson's theorem: Difference between revisions

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In [[physics]] the '''Stoney units''' form a [[system of units]] named after the Irish physicist [[George Johnstone Stoney]], who first proposed them in 1881. They are the first historical example of [[natural units]], i.e. units of measurement designed so that certain [[dimensionless physical constant|fundamental physical constant]]s serve as [[Fundamental unit|base units]]. The set of constants that Stoney used as base units is the following:
<ref>[http://books.google.com/books?id=uSykSbXklWEC&pg=PA291 ''The anthropic cosmological principle'', by Barrow and Tipler, p291]</ref><ref>[http://books.google.com/books?id=sGk05bF9KJEC&pg=PA79 ''Astrophysics, clocks and fundamental constants, by Karshenboim and Peik, p79]</ref>


*[[Elementary charge]], ''e'';
*[[Speed of light]] in a vacuum, ''c'';
*[[Gravitational constant]], ''G'';
*[[Coulomb constant]], 1/(4''&pi;&epsilon;''<sub>0</sub>).


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This means the numerical values, in terms of Stoney units, of all these constants equal one:
 
: <math> e = c = G = 4\pi \varepsilon_0  = 1 \, </math>
 
Stoney's set of base units is similar to the one used in [[Planck units]], proposed independently by Planck thirty years later, but Planck replaced the elementary charge with the [[Planck constant]].<ref name=Penz>[http://books.google.com/books?id=nzbuV_WWS5EC&pg=PA191 Space: in science, art and society, by Penz, Radick, Howell, p191]</ref>
In Stoney units, the numerical value of Planck's constant is not 1, but is
 
:<math>\hbar = \frac{1}{\alpha} \approx 137.035999679 </math>
 
where ''&alpha;'' is the [[fine-structure constant]]. Planck units are more commonly used than Stoney units in modern physics, especially [[quantum gravity]] (including [[string theory]]). Rarely, Planck units are referred to as Planck-Stoney units.<ref name=Penz/>
 
==History==
[[George Johnstone Stoney|George Stoney]] was one of the first scientists to understand that electric charge was quantized; from this quantization he deduced the units that are now named after him.<ref>Stoney G.
On The Physical Units of Nature, Phil.Mag. '''11''', 381&ndash;391, 1881</ref>
<ref>G. Johnstone Stoney, [http://books.google.com/books?id=R79WAAAAIAAJ&pg=PA51&dq=%22On+The+Physical+Units+of+Nature%22&hl=en&ei=Y7fyTPquF4nQsAPAxJTZCw&sa=X&oi=book_result&ct=result&resnum=1&ved=0CCMQ6AEwAA#v=onepage&q=%22On%20The%20Physical%20Units%20of%20Nature%22&f=false On The Physical Units of Nature], The Scientific Proceedings of the Royal Dublin Society, '''3''', 51&ndash;60, 1883. Retrieved 2010-11-28.
</ref>
James G. O’Hara<ref name = "O’Hara1">
J.G. O’Hara (1993). George Johnstone Stoney and the Conceptual Discovery of the Electron, Occasional Papers in Science and Technology, Royal Dublin Society 8, 5&ndash;28.</ref>
pointed out in 1974 that Stoney’s derived estimate of the ''unit of charge'', 10<sup>−20</sup> ampere-second, was {{frac|16}} of the modern value of the charge of the electron. The reason is that Stoney used the approximated value of 10<sup>18</sup> for the number of molecules presented in one cubic millimetre of gas at [[Standard conditions for temperature and pressure|standard temperature and pressure]]. Using the modern values for [[Avogadro constant|Avogadro’s number]] {{val|6.0238|e=23}} and for the volume of a [[Mole (unit)|gram-molecule]] (at [[Standard conditions for temperature and pressure|s.t.p.]]) of {{val|22.4146|e=6|u=mm<sup>3</sup>}}, the modern value is {{val|2.687|e=16}}, instead of Stoney's 10<sup>18</sup>.
 
==Stoney units and Planck units==
The Stoney length and the Stoney energy, collectively called the ''Stoney scale'', are not far from the Planck length and the Planck energy, the ''Planck scale''. The Stoney scale and the [[Planck scale]] are the length and energy scales at which quantum processes and gravity occur together. At these scales, a [[unified theory]] of physics is thus required. The only notable attempt to construct such a theory from the Stoney scale was that of H. Weyl, who associated a gravitational unit of charge with the Stoney length<ref name = Tomilin1>
K. Tomilin, “Natural System of Units”, Proc. of the XX11 International Workshop on High Energy Physics and Field theory, (2 000) 289.</ref><ref name = Weyl1>H. Weyl, “Gravitation und Elekrizitaet”, Koniglich Preussische Akademie der Wissenschaften (1918) 465&ndash;78</ref><ref name = Weyl2>
H. Weyl, “Eine Neue Erweiterung der Relativitaetstheorie”, Annalen der Physik 59 (1919) 101&ndash;3.</ref>
and who appears to have inspired Dirac’s fascination with the [[Dirac large numbers hypothesis|large number hypothesis]].<ref name = Gorelik1>
G. Gorelik, “Hermann Weyl and Large Numbers in Relativistic Cosmology”, Einstein Studies in Russia, (ed. Y. Balashov and V. Vizgin), Birkhaeuser. (2002).</ref>
Since then, the Stoney scale has been largely neglected in the development of modern physics, although it is occasionally discussed to this day.<ref name = Castans1>
M. Castans and J. Belinchon(1998). “Enlargement of Planck’s System of Absolute Units”, preprint: physics/9811018</ref><ref name = Ross1>
Ross McPherson. Stoney Scale and Large Number Coincidences. Apeiron, Vol. 14, No. 3, July 2007</ref>
The Planck scale is valid for all known interactions, and does not give prominence to the electromagnetic interaction, as the Stoney scale does.
 
==See also==
{{Portal|Physics}}
* [[Dimensional analysis]]
* [[Natural units]]
* [[Physical constant]]s
* [[Planck scale]]
 
==Footnotes==
{{Reflist}}
 
==External links==
{{systems of measurement}}
 
{{DEFAULTSORT:Stoney Scale Units}}
[[Category:Natural units| ]]

Revision as of 19:39, 7 June 2013

In physics the Stoney units form a system of units named after the Irish physicist George Johnstone Stoney, who first proposed them in 1881. They are the first historical example of natural units, i.e. units of measurement designed so that certain fundamental physical constants serve as base units. The set of constants that Stoney used as base units is the following: [1][2]

This means the numerical values, in terms of Stoney units, of all these constants equal one:

Stoney's set of base units is similar to the one used in Planck units, proposed independently by Planck thirty years later, but Planck replaced the elementary charge with the Planck constant.[3] In Stoney units, the numerical value of Planck's constant is not 1, but is

where α is the fine-structure constant. Planck units are more commonly used than Stoney units in modern physics, especially quantum gravity (including string theory). Rarely, Planck units are referred to as Planck-Stoney units.[3]

History

George Stoney was one of the first scientists to understand that electric charge was quantized; from this quantization he deduced the units that are now named after him.[4] [5] James G. O’Hara[6] pointed out in 1974 that Stoney’s derived estimate of the unit of charge, 10−20 ampere-second, was Template:Frac of the modern value of the charge of the electron. The reason is that Stoney used the approximated value of 1018 for the number of molecules presented in one cubic millimetre of gas at standard temperature and pressure. Using the modern values for Avogadro’s number Template:Val and for the volume of a gram-molecule (at s.t.p.) of Template:Val, the modern value is Template:Val, instead of Stoney's 1018.

Stoney units and Planck units

The Stoney length and the Stoney energy, collectively called the Stoney scale, are not far from the Planck length and the Planck energy, the Planck scale. The Stoney scale and the Planck scale are the length and energy scales at which quantum processes and gravity occur together. At these scales, a unified theory of physics is thus required. The only notable attempt to construct such a theory from the Stoney scale was that of H. Weyl, who associated a gravitational unit of charge with the Stoney length[7][8][9] and who appears to have inspired Dirac’s fascination with the large number hypothesis.[10] Since then, the Stoney scale has been largely neglected in the development of modern physics, although it is occasionally discussed to this day.[11][12] The Planck scale is valid for all known interactions, and does not give prominence to the electromagnetic interaction, as the Stoney scale does.

See also

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Footnotes

43 year old Petroleum Engineer Harry from Deep River, usually spends time with hobbies and interests like renting movies, property developers in singapore new condominium and vehicle racing. Constantly enjoys going to destinations like Camino Real de Tierra Adentro.

External links

Template:Systems of measurement

  1. The anthropic cosmological principle, by Barrow and Tipler, p291
  2. Astrophysics, clocks and fundamental constants, by Karshenboim and Peik, p79
  3. 3.0 3.1 Space: in science, art and society, by Penz, Radick, Howell, p191
  4. Stoney G. On The Physical Units of Nature, Phil.Mag. 11, 381–391, 1881
  5. G. Johnstone Stoney, On The Physical Units of Nature, The Scientific Proceedings of the Royal Dublin Society, 3, 51–60, 1883. Retrieved 2010-11-28.
  6. J.G. O’Hara (1993). George Johnstone Stoney and the Conceptual Discovery of the Electron, Occasional Papers in Science and Technology, Royal Dublin Society 8, 5–28.
  7. K. Tomilin, “Natural System of Units”, Proc. of the XX11 International Workshop on High Energy Physics and Field theory, (2 000) 289.
  8. H. Weyl, “Gravitation und Elekrizitaet”, Koniglich Preussische Akademie der Wissenschaften (1918) 465–78
  9. H. Weyl, “Eine Neue Erweiterung der Relativitaetstheorie”, Annalen der Physik 59 (1919) 101–3.
  10. G. Gorelik, “Hermann Weyl and Large Numbers in Relativistic Cosmology”, Einstein Studies in Russia, (ed. Y. Balashov and V. Vizgin), Birkhaeuser. (2002).
  11. M. Castans and J. Belinchon(1998). “Enlargement of Planck’s System of Absolute Units”, preprint: physics/9811018
  12. Ross McPherson. Stoney Scale and Large Number Coincidences. Apeiron, Vol. 14, No. 3, July 2007