Timeline for Conservation of entropy in cosmology
Current License: CC BY-SA 4.0
19 events
| when toggle format | what | by | license | comment | |
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| S Jan 29, 2022 at 13:10 | history | bounty ended | Adri Escañuela | ||
| S Jan 29, 2022 at 13:10 | history | notice removed | Adri Escañuela | ||
| Jan 26, 2022 at 14:03 | history | edited | Qmechanic♦ |
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| Jan 26, 2022 at 12:00 | history | tweeted | twitter.com/StackPhysics/status/1486307962301861888 | ||
| Jan 26, 2022 at 10:24 | vote | accept | Adri Escañuela | ||
| Jan 26, 2022 at 7:54 | answer | added | GiorgioP-DoomsdayClockIsAt-90 | timeline score: 3 | |
| Jan 25, 2022 at 3:24 | history | edited | Adri Escañuela | CC BY-SA 4.0 |
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| S Jan 25, 2022 at 3:22 | history | bounty started | Adri Escañuela | ||
| S Jan 25, 2022 at 3:22 | history | notice added | Adri Escañuela | Authoritative reference needed | |
| Jan 23, 2022 at 17:31 | comment | added | Adri Escañuela | Books: Cosmology by Baumann pages 55-56, "The Early Universe" by E. Kolb and M. Turner pages 65-66, Modern Cosmology by Scott Dodelson pages 44-45, page 56 exercise 14. | |
| Jan 23, 2022 at 8:35 | comment | added | anna v | even in the radiation era there will be interactions of the constituents which will lead to an increase of the number of microstates to the macrostate, en.wikipedia.org/wiki/Entropy#Definitions_and_descriptions ."The concept of entropy is described by two principal approaches, the macroscopic perspective of classical thermodynamics, and the microscopic description central to statistical mechanics" en.wikipedia.org/wiki/Entropy_(statistical_thermodynamics) | |
| Jan 23, 2022 at 8:25 | comment | added | anna v | Can you please give a link on your "some books give in order to prove that the entropy of the universe is conserved (S is constant)." or a book reference?. I am afraid you have misunderstood something. | |
| Jan 23, 2022 at 8:22 | comment | added | anna v | @AdriEscañuela But you are using the thermodynamic formulas!!! | |
| Jan 23, 2022 at 0:17 | comment | added | Adri Escañuela | @GiorgioP yeah, I know that people that work with thermodynamics have another understanding of "universe", but that's why the title says "in cosmology". Also, the question has been edited, I hope it's clearer now. | |
| Jan 23, 2022 at 0:16 | history | edited | Adri Escañuela | CC BY-SA 4.0 |
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| Jan 22, 2022 at 23:55 | comment | added | GiorgioP-DoomsdayClockIsAt-90 | @AdriEscañuela Without specifying which definition of entropy one is using, any statement about entropy is meaningless. Notwithstanding the claims of many cosmologists, it is not easy to connect some "entropy of the universe" with the usual thermodynamic concept. Moreover, it is not clear what $f$ is in your question. | |
| Jan 22, 2022 at 23:40 | comment | added | Adri Escañuela | @BobD In cosmology, during the radiation era, entropy is conserved. | |
| Jan 22, 2022 at 23:36 | comment | added | Bob D | " I've been trying to follow the procedure that some books give in order to prove that the entropy of the universe is conserved (S is constant". Where did you hear that? Entropy, unlike energy, is not a conserved property. | |
| Jan 22, 2022 at 23:31 | history | asked | Adri Escañuela | CC BY-SA 4.0 |