Cosmological matching conditions

Details Cosmological matching conditions Cosmological matching conditions

2006-09-26

arxiv.org/abs/hep-th/0609183v1

JCAP 0706:014,2007

Physics

High Energy Physics

High Energy Physics - Theory

12 pages, no figures

Scientific paper

10.1088/1475-7516/2007/06/014

We investigate the evolution of scalar metric perturbations across a sudden cosmological transition, allowing for an inhomogeneous surface stress at the transition leading to a discontinuity in the local expansion rate, such as might be expected in a big crunch/big bang event. We assume that the transition occurs when some function of local matter variables reaches a critical value, and that the surface stress is also a function of local matter variables. In particular we consider the case of a single scalar field and show that a necessary condition for the surface stress tensor to be perturbed at the transition is the presence of a non-zero intrinsic entropy perturbation of the scalar field. We present the matching conditions in terms of gauge-invariant variables assuming a sudden transition to a fluid-dominated universe with barotropic equation of state. For adiabatic perturbations the comoving curvature perturbation is continuous at the transition, while the Newtonian potential may be discontinuous if there is a discontinuity in the background Hubble expansion.

Affiliated with

Also associated with

No associations

Rating

Cosmological matching conditions 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 Cosmological matching conditions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cosmological matching conditions will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-261245