Collision of Domain Walls and Reheating of the Brane Universe

Details Collision of Domain Walls and Reheating of the Brane Universe Collision of Domain Walls and Reheating of the Brane Universe

2004-06-25

arxiv.org/abs/hep-th/0406235v1

Phys.Rev. D70 (2004) 123514

Physics

High Energy Physics

High Energy Physics - Theory

10 pages, 12 figures

Scientific paper

10.1103/PhysRevD.70.123514

We study a particle production at the collision of two domain walls in 5-dimensional Minkowski spacetime. This may provide the reheating mechanism of an ekpyrotic (or cyclic) brane universe, in which two BPS branes collide and evolve into a hot big bang universe. We evaluate a production rate of particles confined to the domain wall. The energy density of created particles is given as $\rho \approx 20 \bar{g}^4 N_b ~m_\eta^4 $ where $\bar{g}$ is a coupling constant of particles to a domain-wall scalar field, $N_b $ is the number of bounces at the collision and $m_\eta$ is a fundamental mass scale of the domain wall. It does not depend on the width $d$ of the domain wall, although the typical energy scale of created particles is given by $\omega\sim 1/d$. The reheating temperature is evaluated as $T_{\rm R}\approx 0.88 ~ \bar{g} ~ N_b^{1/4}$. In order to have the baryogenesis at the electro-weak energy scale, the fundamental mass scale is constrained as $m_\eta \gsim 1.1\times 10^7$ GeV for $\bar{g}\sim 10^{-5}$.

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