A. Einstein - W. Heisenberg
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To go further: The early hours

The first motivation for that work is philosophical and indirectly related to the fact that Homo Sapiens, in opposition with most others species which are living on the Earth (bees and ants excepted), has decided to understand his environment and to modify it in such a manner that he hopes to built his future in a safer way than he did it for its past.
The second motivation is exposed in numerous good articles and lies on the fact that the scientific community has actually accumulated enough arguments justifying the necessity to extend A. Einstein's theory [II-01]. For example the abstract in [I-01] recall why it is believed that the relations concerning gravitation within the Einstein's field equations [II-01-a, b] may not be the most general one. In fact, any researcher interested by this part of physics and knowing the history of sciences (inclusively of scientific publications {This is not quite easy, especially when Homo Sapiens is coming back in evolution to the Monkey level and making wars), would have reached the same conclusion without long debates in considering the work [II-01-c; in French language]. In the latter (1922), E. Cartan (i) recovers the equations obtained about five years earlier by A. Einstein, (ii) introduces the cosmological constant for mathematical reasons and (iii) already suggests a link with physics involving a question of pressure in our universe {And it should be remarked here that that notion of pressure plays a central role in any discussion related to the viability of wormholes).
Inside this quest for plausible extensions of Einstein's work, recent articles (2017) have brought both (i) an emotional chock inside the communities and (ii) a clarification concerning the plausible candidates [I-02]. An old mathematical prediction has been confirmed by experiments: the gravitational information travels with the same speed than the electromagnetic (EM) waves: c(gravitation) = c(EM). This fact eliminates a whole set of alternative theories including the ``De Sitter - Horndeski'', the ``modified Gauss-Bonnet'' and quite more (see the reference for details).
The readers may also find a actually more speculative but also more enthusiastic motivation for these researches: the wormholes problematic (see, e.g.: [I-03]). Rooted in the seminal article [I-04], and doped by the evolution of the human society (increasing demography, diverse deficits in vital resources, etc.) that search for realistic exits driving the civilization into the direction of new and hopefully better worlds has catch much attention; e.g.: the film ``Interstellar''!

Bibliography:

[I-01] Moulin, F.: Generalization of Einstein's field equations; in The European Physical Journal C, 2017, 77:878; open access publication.

[I-02] Dark energy after GW 170817: Dead ends and the road ahead; Phys. Rev. Lett. 119, 251303 (2017), December 18, \copyright American Physical Society.

[I-03] Static traversable wormholes in Lyra manifold; arXiv:1705.06591v2 [Physics.gen-ph], 20 October 2017.

[I-04] Einstein, A. and Rosen, N.: The particle problem in the theory of relativity; pp. 73-77, physical review, vol. 48, July 1, 1935.

[II-01] (a) Einstein, A. : Die Grundlage der allgemeinen Relativitätstheorie; Annalen der Physik, vierte Folge, Band 49, (1916), N 7. (b) Einstein, A. and Minkowski, H.: The principle of relativity; translated in English by Saha, M.N. and Bose, S.N. published by the university of Calcutta, 1920; available at the Library of the M.I.T. (c) Cartan, E. : Sur les équations de la gravitation d'Einstein ; extrait du journal de mathématiques, 1922, Fasc. numéro 2, édité par Gauthier-Villars et Cie, libraires du bureau des longitudes de l'école Polytechnique, Paris, 1922.

[II-02] Heisenberg, W. (1927), "Über den anschaulichen Inhalt der quantentheoretischen Kinematik und Mechanik".

Updated: 03 May 2018