Computer Science
Scientific paper
Jul 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005gregr..37.1205h&link_type=abstract
General Relativity and Gravitation, Volume 37, Issue 7, pp.1205-1219
Computer Science
2
Cosmology, Theory Of Perturbations
Scientific paper
We present the analytical solution to the linear evolution equation of a one component Friedmann perturbation using an equation of state of the form p = (1/3)μσ2(t), where μ is the mass density and σ(t) is the root mean square (rms) velocity in the matter dominated epoch. It is assumed that this rms velocity depends only on the time coordinate and decreases as 1/a, a being the expansion factor of the Friedmann background. The evolution equations are written for scales below the horizon using the longitudinal gauge. The general solution, in the coordinate space, of the evolution equation for the scalar mode is obtained. In the case of spherical symmetry, this solution is expressed in terms of unidimensional integrals of the initial conditions: the initial values of the Newtonian potential and its first time derivative. This perfect fluid solution is a good approximation to the evolution of warm dark matter perturbations obtained by solving the Vlasov’s equation for collisionless particles.
Herrero Alicia
Portilla Miguel
No associations
LandOfFree
Analytical perfect fluid perturbation for the matter dominated epoch 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 Analytical perfect fluid perturbation for the matter dominated epoch, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Analytical perfect fluid perturbation for the matter dominated epoch will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1250101