Clarifying spherical collapse in coupled dark energy cosmologies

Details Clarifying spherical collapse in coupled dark energy cosmologies Clarifying spherical collapse in coupled dark energy cosmologies

2010-05-07

arxiv.org/abs/1005.1278v2

Phys.Rev.D82:103516,2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

16 pages, 13 figures, published in Physical Review D, minor changes and corrections

Scientific paper

10.1103/PhysRevD.82.103516

The spherical collapse model is often used to follow the evolution of overdensities into the nonlinear regime. We describe the correct approach to be used in coupled dark energy cosmologies, where a fifth force, different from gravity and mediated by the dark energy scalar field, influences the collapse. We reformulate the spherical collapse description by deriving it directly from the set of nonlinear hydrodynamical Navier Stokes equations. By comparing with the corresponding relativistic equations, we show how the fifth force should be taken into account within the spherical collapse picture and clarify the problems arising when an inhomogeneous scalar field is considered within a spherical collapse picture. We then apply our method to the case of coupled quintessence, where the fifth force acts among cold dark matter particles, and to growing neutrino quintessence, where the fifth force acts between neutrinos. Furthermore, we review this method when applied to standard cosmologies and apply our analysis to minimally coupled quintessence and check past results for early dark energy parametrizations.

Affiliated with

Also associated with

No associations

Rating

Clarifying spherical collapse in coupled dark energy cosmologies 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 Clarifying spherical collapse in coupled dark energy cosmologies, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Clarifying spherical collapse in coupled dark energy cosmologies will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-223439