| [ KAIST ] in KIDS 글 쓴 이(By): pictor (gaugefield) 날 짜 (Date): 2001년 5월 12일 토요일 오후 09시 59분 59초 제 목(Title): Re: [Q] 물리과 출신만 봐주세요 흐흐흐 나 픽터만 이거 모르고 있었나? Lorentz gauge인줄로만 알고 살았네... +++ http://www.treasure-troves.com/physics/LorenzGauge.html Lorenz gauge: Although this gauge is often erroneously attributed to the Dutch physicist H. A. Lorentz (Griffiths 1998), it was actually published by the Danish physicist L. Lorenz (Lorenz 1867, Whittaker 1989, van Bladel 1991). Lorentz, Hendrik Antoon(1853-1928) Dutch physicist who was converted from Helmholtz's electromagnetic theory by Hertz's experiments, which he felt were "the greatest triumph that Maxwell's theory has achieved." Using the Maxwellian framework, he proposed a universal theory of physics based purely on the concepts of electromagnetism. The fundamental postulates, which were completely independent of mechanical principles, were presented in "Versuch einer Theorie der elektrischen und optischen Erscheinungen in between Korpern" ("Inquiry into a Theory of Electrical and Optical Phenomena in Moving Bodies," 1905). Independently of Fitzgerald, Lorentz he suggested the null result of the Michelson-Morley experiment resulted from a contraction of the arms of the interferometer in the direction of the Earth's motion. Lorentz, Ludwig(1829-1891) Danish physicist who explained the transmission of forces through fields using differential equations . He demonstrated that electrical forces were propagated at the speed of light. The Lorenz gauge of electromagnetism is named in Lorenz's honor. Lorentz ============================================================================== It is Lorenz gauge, not Lorentz gauge. It was introduced by Ludwig Lorenz, not Hendrik Lorentz. See: http://www.treasure-troves.com/physics/LorenzGauge.html http://www.treasure-troves.com/bios/Lorentz.html http://www.treasure-troves.com/bios/Lorenz.html It is Lorentz transformation, Lorentz force, but Lorenz gauge! ==== There is no Lorentz condition, only Lorenz condition, invented by the Danish physicist Ludwig Lorenz in 1867, when the Dutch physicist H.A. Lorentz was only 14 years. ==== In this web-page you say: "Underlying the transformation for time dilation derived by H.A. Lorenz". It seems that you have got wrong the name of H.A. Lorentz, who was the first one to demonstrate the covariance of the Maxwell equations under the Lorentz transformations in 1903. Usually people make the mistake the other way around, and claim that Lorenz condition/gauge is due to Lorentz, although it was invented by Ludwig Lorenz, when Lorentz was only 14 years old. See J. van Bladel: Lorenz or Lorentz, The Radioscientist 2 (1991) p. 55, IEEE Antennas and Propagation Magazine 33 (1991) p. 69.-- Pertti Lounesto http://www.math.hut.fi/~lounesto The relevant contributions to Lorentz transformations and their relations to Maxwell equations, are as follows: 1867 Lorenz, not Lorentz, found Lorenz gauge of the Maxwell equations. 1887 Voigt recognized that the wave equation is invariant with respect to a change of variables where also time is transformed. Voigt's formulas are Lorentz transformations up to a scale factor q. 1892 FitzGerald and Lorentz introduced q = 1/sqrt(1-v^2/c^2) in another connection, when explaining the Michelson & Morley experiment. 1900 Larmor considered Lorentz transformations of space-time events. 1903 Lorentz demonstrated Lorentz covariance of the Maxwell equations. 1910 Cunningham and Bateman showed the conformal covariance of the Maxwell equations. Voigt's transformations, as well as Lorentz transformations, are special cases of conformal transformations. 1921, 1926, 1934 Weyl, Cartan, Danzig found that the Maxwell equations are independent of metric: they are invariant under GL(4,R). For more details on the history of Lorentz transformations and electromagnetism see the sections entitled "Historical survey" of the chapters "Lorentz Transformations" and "Electromagnetism" of my book "Clifford Algebras and Spinors", CUP, 1997, with URL: http://www.cup.org/Titles/59/0521599164.html. |