Einstein's Unified Field Theory: Approaches Explored

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Discussion Overview

The discussion centers on the various approaches Einstein explored during his later years in pursuit of a Unified Field Theory (UFT). Participants seek to understand the theoretical frameworks and concepts he considered, including historical context and specific models.

Discussion Character

  • Exploratory
  • Technical explanation
  • Historical

Main Points Raised

  • One participant inquires about the specific approaches Einstein attempted in his last 30 years regarding Unified Field Theory.
  • Another participant mentions Kaluza-Klein theory as a geometric approach to unify electromagnetism with General Relativity (GR).
  • A participant describes Einstein's final classical UFT as presented in an appendix of "The Meaning of Relativity," highlighting the use of a non-symmetric pseudo-tensor and various invariance properties to derive field equations.
  • It is noted that little work was done on Einstein's final theory, as its motivation and conceptual structure were not widely accepted.
  • A reference to a detailed presentation of Einstein's final UFT is provided for further exploration.

Areas of Agreement / Disagreement

Participants express varying levels of knowledge and interest in Einstein's approaches, but there is no consensus on the validity or acceptance of his final theories. Multiple perspectives on Kaluza-Klein theory and Einstein's UFT remain present.

Contextual Notes

Some limitations include the lack of detailed exploration of Einstein's final UFT by the community and the dependence on specific interpretations of his theoretical constructs.

Who May Find This Useful

Readers interested in the historical development of theoretical physics, particularly those focused on unified field theories and Einstein's later work.

superbat
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Hi,
Does anyone have details about what Einstein at a higher level tried in his last 30 years when he was working on Unified field theory.
What approaches he tried?
 
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Einstein's final classical unified field theory was described in the 5th edition of his "The Meaning of Relativity", in an appendix. To his death, he believed that this version 'might be true'. In this, he proposed a non-symmetric pseudo-tensor, similar to but not the same as an affine connection, and posited various properties to restrict possible equations (transposition invariance, lambda invariance). Field equations come from a variational principle constructed from a contracted curvature expressed in terms of this pseudo-tensor.

I have never worked through this appendix in detail. So far as I know, very little work was ever done on this theory, as no one believed its motivation and conceptual structure. Like string theory, it begged for solutions corresponding to known observations.
 
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For a presentation and discussion of Einein's final UFT, see section 9.4 and the rest of chapter 9 of:

http://relativity.livingreviews.org/Articles/lrr-2014-5/title.html
 
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Thanks a lot PAllen
 

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