Inflationary cosmology and thermodynamics
| dc.creator | Gunzig, E | |
| dc.creator | Maartens, R | |
| dc.creator | Nesteruk, A | |
| dc.date | 1997-03-21 | |
| dc.date | 1997-12-03 | |
| dc.date.accessioned | 2026-07-07T11:08:23Z | |
| dc.date.available | 2026-07-07T11:08:23Z | |
| dc.description | We present a simple and thermodynamically consistent cosmology with a phenomenological model of quantum creation of radiation due to vacuum decay. Thermodynamics and Einstein's equations lead to an equation in which $H$ is determined by the particle number $N$. The model is completed by specifying the particle creation rate $Γ=\dot{N}/N$, which leads to a second-order evolution equation for $H$. We propose a simple $Γ$ that is naturally defined and that conforms to the thermodynamical conditions: (a) the entropy production rate starts at a maximum; (b) the initial vacuum (for radiation) is a non-singular regular vacuum; and (c) the creation rate is initially higher than the expansion rate $H$, but then falls below $H$. The evolution equation for $H$ then has a remarkably simple exact solution, in which a non-adiabatic inflationary era exits smoothly to the radiation era, without a reheating transition. For this solution, we give exact expressions for the cosmic scale factor, energy density of radiation and vacuum, temperature, entropy and super-horizon scalar perturbations. | |
| dc.description | Substantially revised, with new results; to appear in Class. Quantum Grav.; 12 pages Latex (ioplppt style) | |
| dc.identifier | https://arxiv.org/abs/astro-ph/9703137 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/9703137 | |
| dc.identifier | Class.Quant.Grav.15:923-932,1998 | |
| dc.identifier | doi:10.1088/0264-9381/15/4/014 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/190119 | |
| dc.subject | Astrophysics | |
| dc.title | Inflationary cosmology and thermodynamics | |
| dc.type | text |