On the growth of linear perturbations

Details On the growth of linear perturbations On the growth of linear perturbations

2007-10-08

arxiv.org/abs/0710.1510v2

Phys.Lett.B660:439-443,2008

Astronomy and Astrophysics

Astrophysics

8 pages, 8 figures. Results unchanged; clarifying sentence added; one reference added

Scientific paper

10.1016/j.physletb.2008.01.032

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 $\Lambda$CDM $\gamma'_0\equiv \frac{d\gamma}{dz}_0$ lies in a very narrow interval $-0.0195 \le \gamma'_0 \le -0.0157$ for $0.2 \le \Omega_{m,0}\le 0.35$. Models with a constant equation of state inside General Relativity (GR) are characterized by a quasi-constant $\gamma'_0$, for $\Omega_{m,0}=0.3$ for example we have $\gamma'_0\approx -0.02$ while $\gamma_0$ can have a nonnegligible variation. A smoothly varying equation of state inside GR does not produce either $|\gamma'_0|>0.02$. A measurement of $\gamma(z)$ on small redshifts could help discriminate between various DE models even if their $\gamma_0$ is close, a possibility interesting for DE models outside GR for which a significant $\gamma'_0$ can be obtained.

Affiliated with

Also associated with

No associations

Rating

On the growth of linear perturbations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with On the growth of linear perturbations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and On the growth of linear perturbations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-544208