2004/06/25 by Yu-ichi Takamizu, Kei-ichi Maeda, Kei Maeda
Physics and Astronomy · #Black Holes and Theoretical Physics #Cosmology and Gravitation Theories #Galaxies: Formation, Evolution, Phenomena #astro-ph #gr-qc #hep-ph #hep-th
paper · pdf · doi:10.1103/physrevd.70.123514
published as Phys.Rev. D70 (2004) 123514 · 10 pages, 12 figures
arxiv created 2004/06/25 · openalex publication_date 2004/12/09 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We study 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 \ensuremathρ\ensuremath≈20g4Nbm_\ensuremathη4 where g is a coupling constant of particles to a domain-wall scalar field, Nb is the number of bounces at the collision and m_\ensuremathη is the 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 \ensuremathω\ensuremath∼1/d. The reheating temperature is evaluated as TR\ensuremath≈0.88gNb1/4. In order to have the baryogenesis at the electro-weak energy scale, the fundamental mass scale is constrained as m_\ensuremathη\ensuremath\gtrsim1.1\ifmmode×\else\texttimes\fi107 GeV for g\ensuremath∼10^\ensuremath-5.