Model Independent Accelerating Universe and the Cosmological Coinc idence Problem
| dc.creator | de la Macorra, A. | |
| dc.date | 1999-11-05 | |
| dc.date.accessioned | 2026-07-07T11:34:14Z | |
| dc.date.available | 2026-07-07T11:34:14Z | |
| dc.description | We show that the evolution of the quintessence energy density $Ω_Q$ is model independent in an accelerating universe. The accelerating behaviour has lasted at most 0.5 e-folds of expansion assuming a present day value of $Ω_Q=2/3$. The generic evolution differs from the exact solution by a percentage given by $r=2\gm_Q$, with $\gm_Q=(ρ_Q+p_Q)/ρ_Q$. For a small $\gm_Q$ the evolution remains a good approximation for a long period. Nucleosynthesis bounds on $Ω_Q$ suggest that the model independent solution is valid for at least 12 e-folds of expansion which includes then the scale of radiation and matter equality. We can, therefore, establish model independent conditions on the cosmological parameters at some factor scale $a_i \ll a_o$. Finally, we discuss the relevance of this result to the cosmological coincidence problem. | |
| dc.description | 6 Pages, LaTeX, 1 eps figure | |
| dc.identifier | https://arxiv.org/abs/astro-ph/9911079 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/9911079 | |
| dc.identifier | Int.J.Mod.Phys.D9:661-668,2000 | |
| dc.identifier | doi:10.1016/S0218-2718(00)00065-7 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/198173 | |
| dc.subject | Astrophysics | |
| dc.title | Model Independent Accelerating Universe and the Cosmological Coinc idence Problem | |
| dc.type | text |