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seen Jun 26 at 12:29

Jun
26
accepted Relationship between gravitational time dilation and energy?
Jun
24
asked Relationship between gravitational time dilation and energy?
Jun
16
accepted Derivation of form of perfect fluid stress-energy tensor
Jun
16
asked Derivation of form of perfect fluid stress-energy tensor
Jun
13
comment Does the total particle energy increase in FRW Universe?
Sorry - which calculation are you referring to?
Jun
13
comment Does the total particle energy increase in FRW Universe?
Perhaps the radiation energy actually stays constant and it's the observer's energy which is increasing, with respect to conformal time.
Jun
13
comment Does the total particle energy increase in FRW Universe?
The redshift would be due to observers' clocks running faster with respect to conformal time as the Universe expands. See one of @MichaelSeifert's replies in physics.stackexchange.com/a/186483/22307. (I think he meant clocks run faster rather than slower).
Jun
13
revised Does the total particle energy increase in FRW Universe?
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Jun
13
revised Does the total particle energy increase in FRW Universe?
added 22 characters in body
Jun
12
revised Does the total particle energy increase in FRW Universe?
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Jun
12
revised Does the total particle energy increase in FRW Universe?
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Jun
12
asked Does the total particle energy increase in FRW Universe?
Jun
9
comment How to show flat FRW metric has a time-like conformal Killing vector?
Do I have to calculate the expression given by @GabrielCozzella in answer#1 ? Seems like a lot of work calculating all those covariant derivatives with their Christoffel symbols etc! is there an easier way?
Jun
9
revised How to show flat FRW metric has a time-like conformal Killing vector?
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Jun
9
asked How to show flat FRW metric has a time-like conformal Killing vector?
Jun
8
awarded  Nice Question
Jun
7
comment Conformal time-like Killing vector near null geodesics in all spacetimes?
I am wondering if it is generally true that photons propagate with constant energy with respect to conformal time. I am interested in the case of FRW cosmology where this might imply that photon energy density $\rho_{rad}\propto 1/a^3$ rather than the conventional $1/a^4$.
Jun
7
revised Conformal time-like Killing vector near null geodesics in all spacetimes?
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Jun
7
asked Conformal time-like Killing vector near null geodesics in all spacetimes?
Jun
4
comment Energies of bodies travelling on different geodesics
I was wondering if there is a path-independent energy potential in GR perhaps related to the $tt$-component of the metric in some way.