Timeline for Does the fact that energy is not conserved in cosmology open the possibility of new matter/atoms being created in the universe?
Current License: CC BY-SA 4.0
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| Jun 4, 2020 at 16:03 | history | edited | CommunityBot |
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| May 13, 2018 at 16:12 | comment | added | Árpád Szendrei | en.wikipedia.org/wiki/Baryon_asymmetry | |
| May 13, 2018 at 16:12 | comment | added | Árpád Szendrei | According to the Big Bang model, matter decoupled from the cosmic background radiation (CBR) at a temperature of roughly 3000 kelvin, corresponding to an average kinetic energy of 3000 K / (10.08×103 K/eV) = 0.3 eV. After the decoupling, the total number of CBR photons remains constant. Therefore, due to space-time expansion, the photon density decreases. | |
| May 13, 2018 at 16:12 | comment | added | Árpád Szendrei | The challenges to the physics theories are then to explain how to produce this preference of matter over antimatter, and also the magnitude of this asymmetry. An important quantifier is the asymmetry parameter, η = n B − n B ¯ n γ {\displaystyle \eta ={\frac {n_{B}-n_{\bar {B}}}{n_{\gamma }}}} \eta = \frac{n_B - n_{\bar B}}{n_\gamma}. This quantity relates the overall number density difference between baryons and antibaryons (nB and nB, respectively) and the number density of cosmic background radiation photons nγ. | |
| May 13, 2018 at 15:18 | comment | added | parker | Do we have any theoretical reasons to think that baryon number violation which leads to baryogenesis only occur at high temperature(ie. early universe in the Big Bang model). | |
| May 13, 2018 at 10:53 | history | answered | Árpád Szendrei | CC BY-SA 4.0 |