Timeline for Is there a Dark Matter Paradox?
Current License: CC BY-SA 4.0
13 events
| when toggle format | what | by | license | comment | |
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| Jun 20 at 7:18 | answer | added | ProfRob | timeline score: 3 | |
| Jun 16 at 21:40 | answer | added | Sten | timeline score: 15 | |
| Jun 16 at 21:16 | comment | added | Sten | I am familiar with what we observe. I am asking if the author of the article you link has calculated what a distant observer would see in their spacetime. (Also, I wonder if they have taken care to ensure their spacetime does not have unphysical singularities. It is interesting that they do not cite 2303.17516.) | |
| Jun 16 at 18:05 | comment | added | Sten | Rotation speeds are not observable. They depend on coordinates. The light that emerges is observable (e.g., how it is frequency shifted). Did the author calculate what an asymptotically distant observer sees? | |
| Jun 16 at 16:42 | history | became hot network question | |||
| Jun 16 at 14:23 | comment | added | timm | To take "confused about coordinates" a little further an example would be that the view 'expanding space" is indeed coordinate dependent as in other coordinates galaxies are moving away. But 'expanding space' is by no means observable, in contrast to flat rotation curves. Therefor the latter shouldn't be coordinate dependent. Would you agree to that? | |
| Jun 16 at 14:00 | answer | added | Alfred | timeline score: 4 | |
| Jun 16 at 12:17 | comment | added | timm | Sten, as I understand it, a spiral galaxy is modeled under the assumption of cylindrical symmetry of a disc, implying axial symmetry. To me this appears obvious, but its my layman view. Is something wrong with those assumptions? | |
| S Jun 16 at 11:30 | history | suggested | GrapefruitIsAwesome | CC BY-SA 4.0 |
Add title to bare hyperlink
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| Jun 16 at 10:36 | comment | added | Sten | Without reading the article, I'm pretty sure the author is confused about coordinates. See arxiv.org/abs/2303.17516 | |
| Jun 16 at 10:30 | review | Suggested edits | |||
| S Jun 16 at 11:30 | |||||
| Jun 16 at 10:16 | history | edited | Qmechanic♦ | CC BY-SA 4.0 |
edited body; edited tags
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| Jun 16 at 8:39 | history | asked | timm | CC BY-SA 4.0 |