Timeline for Does expanding space cost energy?
Current License: CC BY-SA 3.0
13 events
| when toggle format | what | by | license | comment | |
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| Aug 21, 2019 at 14:15 | vote | accept | kutschkem | ||
| Jul 29, 2014 at 14:06 | history | edited | kutschkem | CC BY-SA 3.0 |
corrected proportiona vs inversely proportional
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| Jul 29, 2014 at 13:55 | answer | added | Jim | timeline score: 2 | |
| Jul 29, 2014 at 13:33 | history | edited | kutschkem | CC BY-SA 3.0 |
clarified second question
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| Jul 29, 2014 at 12:45 | answer | added | Trimok | timeline score: 2 | |
| Jul 29, 2014 at 12:04 | history | edited | Qmechanic♦ |
edited tags
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| Jul 29, 2014 at 10:54 | comment | added | kutschkem | @JohnRennie i think at the heart of my question is whether space itself (the metric, i guess) is "created" at the expense of energy. I guess the answers you pointed me to should make the answer "we don't know, but most explanations don't assume it"? I guess asking whether there are models in which space and energy are interchangeable or the same thing, as mass and energy, should be a seperate question. | |
| Jul 29, 2014 at 9:36 | comment | added | John Rennie | There are endless arguments about whether energy is or isn't conserved in the expansion due to dark energy. One view is that it isn't because the amount of dark energy increases with time as the universe expands. An opposing view is that this increase is balanced out by the energy of the gravitational field and overall energy really is conserved. See this article by Luboš Motl and this article by Phil Gibbs for opposing views | |
| Jul 29, 2014 at 9:31 | comment | added | kutschkem | @JohnRennie looking at two different questions and their answers, i found one that i thought said the energy goes to the "dark energy", while another said it was going into the energy of the gravitational field. Is that related or am i mixing unrelated things here? | |
| Jul 29, 2014 at 9:19 | review | Close votes | |||
| Jul 29, 2014 at 16:53 | |||||
| Jul 29, 2014 at 9:02 | comment | added | John Rennie | I've suggested a duplicate because your question boils down to whether energy is conserved during inflation, and the duplicate question addresses this issue. Generally energy is not conserved in GR because by Noether's theorem energy conservation implies time shift symmetry, and this is violated during inflation and indeed during the current phase of accelerated expansion due to dark energy. If you search for energy conservation relativity you'll find many related questions. | |
| Jul 29, 2014 at 9:00 | comment | added | John Rennie | possible duplicate of Energy conservation in General Relativity | |
| Jul 29, 2014 at 8:40 | history | asked | kutschkem | CC BY-SA 3.0 |