Timeline for Background spacetime in general relativity [closed]
Current License: CC BY-SA 4.0
9 events
| when toggle format | what | by | license | comment | |
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| Dec 24, 2020 at 13:10 | history | closed |
Buzz♦ joseph h John Rennie Vincent Thacker GiorgioP-DoomsdayClockIsAt-90 |
Needs details or clarity | |
| Dec 24, 2020 at 9:31 | comment | added | Eletie | This may just be a misunderstanding of the concept of curvature applied to general manifolds (and the difference between intrinsic and extrinsic curvature). In general relativity we're usually talking about Riemann curvature en.wikipedia.org/wiki/Riemann_curvature_tensor - we don't need to make reference to an embedded space to talk about that (i.e. it's intrinsic). We're not saying anything about 'underlying' spacetime, but we understand the geometry of flat space, and we can calculate how much a manifold fails to be isometric to a hypothetical flat space. | |
| Dec 24, 2020 at 9:28 | comment | added | m4r35n357 | Your premise is entirely incorrect. | |
| Dec 24, 2020 at 9:26 | answer | added | magma | timeline score: 2 | |
| Dec 24, 2020 at 9:16 | answer | added | Rd Basha | timeline score: 2 | |
| Dec 24, 2020 at 7:56 | history | edited | Qmechanic♦ | CC BY-SA 4.0 |
edited tags
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| Dec 24, 2020 at 7:20 | comment | added | John Rennie | It isn't clear what you are asking. When we calculate curvature we are calculating the Riemann curvature tensor and this is not relative to anything, except possibly in the sense that the Riemann tensor is zero for a flat spacetime. If you're asking what would happen if our universe was not (spatially) flat the answer is that there would be a cosmological constant. | |
| Dec 24, 2020 at 7:00 | review | Close votes | |||
| Dec 24, 2020 at 13:10 | |||||
| Dec 24, 2020 at 6:37 | history | asked | RaSullivan | CC BY-SA 4.0 |