On the growth of linear perturbations
| dc.creator | Polarski, David | |
| dc.creator | Gannouji, Radouane | |
| dc.date | 2007-10-08 | |
| dc.date | 2007-10-11 | |
| dc.date.accessioned | 2026-07-07T11:19:50Z | |
| dc.date.available | 2026-07-07T11:19:50Z | |
| dc.description | We consider the linear growth of matter perturbations in various dark energy (DE) models. We show the existence of a constraint valid at $z=0$ between the background and dark energy parameters and the matter perturbations growth parameters. For $Λ$CDM $γ'_0\equiv \frac{dγ}{dz}_0$ lies in a very narrow interval $-0.0195 \le γ'_0 \le -0.0157$ for $0.2 \le Ω_{m,0}\le 0.35$. Models with a constant equation of state inside General Relativity (GR) are characterized by a quasi-constant $γ'_0$, for $Ω_{m,0}=0.3$ for example we have $γ'_0\approx -0.02$ while $γ_0$ can have a nonnegligible variation. A smoothly varying equation of state inside GR does not produce either $|γ'_0|>0.02$. A measurement of $γ(z)$ on small redshifts could help discriminate between various DE models even if their $γ_0$ is close, a possibility interesting for DE models outside GR for which a significant $γ'_0$ can be obtained. | |
| dc.description | 8 pages, 8 figures. Results unchanged; clarifying sentence added; one reference added | |
| dc.identifier | https://arxiv.org/abs/0710.1510 | |
| dc.identifier | http://arxiv.org/abs/0710.1510 | |
| dc.identifier | Phys.Lett.B660:439-443,2008 | |
| dc.identifier | doi:10.1016/j.physletb.2008.01.032 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/193822 | |
| dc.subject | Astrophysics | |
| dc.subject | General Relativity and Quantum Cosmology | |
| dc.title | On the growth of linear perturbations | |
| dc.type | text |