Timeline for Is spacetime simply connected?
Current License: CC BY-SA 4.0
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| May 15, 2022 at 20:26 | history | edited | Urb | CC BY-SA 4.0 |
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| Nov 12, 2021 at 18:39 | comment | added | R. Rankin | @TedBunn your example of the three torus is misleading I believe. One can easily have a non-simply connected space (say a wormhole connecting two regions) and yet still have a simply connected space-time. A simple low dimensional example of this is a circle (non simply connected, which bounds a two disk (simply connected). | |
| Jul 11, 2011 at 14:02 | comment | added | Ted Bunn | Thanks for the reference. I'd missed that. As I understand it from a quick glance, the idea here is to look at the case where the fundamental cell size is larger than the horizon (so that the circles-in-the-sky technique doesn't work) but not too much larger (or else there'd be no observable effects at all). This is in principle a sensible thing to do, but in this sort of analysis the details matter a lot, and I haven't looked carefully enough to have a sensible opinion about the details. | |
| Jul 9, 2011 at 16:08 | comment | added | Alex 'qubeat' | Recently preprint appears there also the WMAP data is used, but with claim about possibility of multiply-connected Universe with spatial topology $\mathbb T^2 \times \mathbb R$. It seems not published in a journal yet, but the idea already reproduced in Wikipedia. | |
| Jul 8, 2011 at 20:41 | history | answered | Ted Bunn | CC BY-SA 3.0 |