Non-adiabatic perturbations in decaying vacuum cosmology

Details Non-adiabatic perturbations in decaying vacuum cosmology Non-adiabatic perturbations in decaying vacuum cosmology

2010-09-03

arxiv.org/abs/1009.0672v2

JCAP 04 (2011) 028

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

13 pages, 4 figures, discussion of initial conditions enlarged, accepted for publication in JCAP

Scientific paper

10.1088/1475-7516/2011/04/028

We investigate a spatially flat Friedmann-Lema\^itre-Robertson-Walker cosmology in which a decaying vacuum term causes matter production at late times. Assuming a decay proportional to the Hubble rate, the ratio of the background energy densities of dark matter and dark energy changes with the cosmic scale factor as $a^{-3/2}$. The intrinsically non-adiabatic two-component perturbation dynamics of this model is reduced to a single second-order equation. Perturbations of the vacuum term are shown to be negligible on scales that are relevant for structure formation. On larger scales, dark-energy perturbations give a somewhat higher contribution but remain always smaller than the dark-matter perturbations.

Affiliated with

Also associated with

No associations

Rating

Non-adiabatic perturbations in decaying vacuum cosmology 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 Non-adiabatic perturbations in decaying vacuum cosmology, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Non-adiabatic perturbations in decaying vacuum cosmology will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-684959