All Questions
3
questions
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vote
2
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601
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Expanding universe and Time-translation invariance
My understanding is that there are 5 implicit assumptions when introducing the Lagrangian formulation.
Assumptions:
We appear to know that the principle of stationary action is true for the universe
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0
votes
1
answer
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Is the cosmological time grosso modo isochrone?
Is the cosmological time grosso modo isochrone? by analogy with space isotropy. Or else do we have possibly great differences by analogy with great voids in the space.
We know that it's not strictly ...
user46925
3
votes
1
answer
311
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Time Energy symmetry in General Relativity (not asking about energy conservation)
In General Relativity is there a TE symmetry similar to CPT symmetry in the Standard Model ? It's pretty easy to understand that by flipping charge and parity you merely get a time reversed equivalent ...
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