Timeline for Trying to confirm that the trace of the energy-momentum tensor divided by the energy density is NOT invariant
Current License: CC BY-SA 4.0
6 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Apr 26, 2023 at 13:36 | comment | added | LolloBoldo | What i mean is: you cannot hope to have a scalar quantity invariant along a geodesic if that quantity is not even invariant in a single point of that geodesic, it's meaningless | |
| Apr 26, 2023 at 13:32 | comment | added | LolloBoldo | No, but there is no hope to have something invariant globally if it is not even invariant in a local setting. | |
| Apr 26, 2023 at 12:26 | comment | added | KP99 | I'm not sure why you are using Lorentz transformation in FRW universe, though it doesn't change the answer qualitatively. Observer dependence is not strictly limited to only the tangent space (where you can apply Lorentz transformation) | |
| Apr 26, 2023 at 12:20 | comment | added | perchlorious | That was very clear, thanks. Are there any invariant quantities in an FRW universe that do not change with the volume? | |
| Apr 26, 2023 at 12:12 | vote | accept | perchlorious | ||
| Apr 27, 2023 at 19:57 | |||||
| Apr 26, 2023 at 12:02 | history | answered | LolloBoldo | CC BY-SA 4.0 |