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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Woldemar Voigt ： ウィキペディア英語版 Woldemar Voigt Woldemar Voigt (; 2 September 1850 – 13 December 1919) was a German physicist, who taught at the Georg August University of Göttingen. Voigt eventually went on to head the Mathematical Physics Department at Göttingen and was succeeded in 1914 by Peter Debye, who took charge of the theoretical department of the Physical Institute. In 1921, Debye was succeeded by Max Born. Voigt was born in Leipzig, and died in Göttingen. He was a student of Franz Ernst Neumann. He worked on crystal physics, thermodynamics and electro-optics. His main work was the ''Lehrbuch der Kristallphysik'' (textbook on crystal physics), first published in 1910. He discovered the Voigt effect in 1898. The word tensor in its current meaning was introduced by him in 1898.〔Woldemar Voigt, ''Die fundamentalen physikalischen Eigenschaften der Krystalle in elementarer Darstellung'' (fundamental physical properties of crystals in an elementary presentation ) (Leipzig, Germany: Veit & Co., 1898), p. 20. (From page 20: ) ''"Wir wollen uns deshalb nur darauf stützen, dass Zustände der geschilderten Art bei Spannungen und Dehnungen nicht starrer Körper auftreten, und sie deshalb tensorielle, die für sie charakteristischen physikalischen Grössen aber Tensoren nennen."'' (We therefore want (presentation ) to be based only on (assumption that ) conditions of the type described occur during stresses and strains of non-rigid bodies, and therefore call them "tensorial" but call the characteristic physical quantities for them "tensors".)〕 Voigt profile and Voigt notation are named after him. He was also an amateur musician and became known as a Bach expert (see External links). In 1887 Voigt formulated a form of the Lorentz transformation between a rest frame of reference and a frame moving with speed $v$ in the $x$ direction. However, as Voigt himself declared, the transformation was aimed for a specific problem and did not carry with it the ideas of a general coordinate transformation, as is the case in relativity theory.〔; Reprinted with additional comments by Voigt in ''Physikalische Zeitschrift'' XVI, 381–386 (1915).〕 ==The Voigt transformation== In modern notation Voigt's transformation was :$x^\backslash prime\; =\; x\; -\; vt$ :$y^\backslash prime\; =\; y/\backslash gamma$ :$z^\backslash prime\; =\; z/\backslash gamma$ :$t^\backslash prime\; =\; t\; -\; vx/c^2$ where $\backslash gamma\; =\; 1/\backslash sqrt$. If the right-hand sides of his equations are multiplied by $\backslash gamma$ they are the modern Lorentz transformation. Hermann Minkowski said in 1908 that the transformations which play the main role in the principle of relativity were first examined by Voigt in 1887. Also Hendrik Lorentz (1909) is on record as saying he could have taken these transformations into his theory of electrodynamics, if only he had known of them, rather than developing his own. It is interesting then to examine the consequences of these transformations from this point of view. Lorentz might then have seen that the transformation introduced relativity of simultaneity, and also time dilation. However, the magnitude of the dilation was greater than the now accepted value in the Lorentz transformations. Moving clocks, obeying Voigt's time transformation, indicate an elapsed time $\backslash Delta\; t\_\backslash mathrm\; =\; \backslash gamma^\backslash Delta\; t\; =\; \backslash gamma^\backslash Delta\; t\_\backslash mathrm$, while stationary clocks indicate an elapsed time $\backslash Delta\; t$. Lorentz did not adopt this transformation as he found in 1904 that only the Lorentz contraction corresponds to the principle of relativity. Since Voigt's transformation preserves the speed of light in all frames, the Michelson–Morley experiment and the Kennedy–Thorndike experiment can not distinguish between the two transformations. The crucial question is the issue of time dilation. The experimental measurement of time dilation by Ives and Stillwell (1938) and others settled the issue in favor of the Lorentz transformation. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Woldemar Voigt」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.