48 citations · 96 across the 4 of their papers we have counts for
4 papers
On the Transfer of Metric Fluctuations when Extra Dimensions Bounce or Stabilize
T. J. Battefeld, S. P. Patil, R. H. Brandenberger
In this report, we study within the context of general relativity with one extra dimension compactified either on a circle or an orbifold, how radion fluctuations interact with met…
Perturbations in a regular bouncing Universe
T. J. Battefeld, G. Geshnizjani
We consider a simple toy model of a regular bouncing universe. The bounce is caused by an extra time-like dimension, which leads to a sign flip of the term in the effective f…
Vector Perturbations in a Contracting Universe
Thorsten Battefeld, Robert Brandenberger
In this note we show that vector perturbations exhibit growing mode solutions in a contracting Universe, such as the contracting phase of the Pre Big Bang or the Cyclic/Ekpyrotic m…
Simple Equations for Cosmological Matter and Inflaton Field Interactions
Eckhard Rebhan, Thorsten Battefeld
A simple model for the reheating of the universe after inflation is studied in which an essentially inhomogeneous scalar field representing matter is coupled to an essentially homo…