Collision of domain walls and creation of matter in brane world

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    Abstract

    We study collision of two domain walls in five-dimensional (5D) spacetime and creation of matter fields. This may provide the reheating mechanism in cosmological models based on a colliding-brane scenario such as the ekpyrotic (or cyclic) universe. We first analyze the dynamics of colliding domain walls both in 5D Minkowski back-ground spacetime and in asymptotic AdS spacetime including self-gravity. We find that multiple bounces appear at collision. In the case with gravity, we find that a spacelike curvature singularity is formed in the bulk, but it is covered by a horizon. Next we analyze production of particles at collision of two domain walls. For a scalar field, the energy density of created particles is evaluated as ρ ≈ 20g -4Nb mφ 4 where ḡ is a coupling constant of particles to a domain-wall scalar field, Nb is the number of bounces at the collision and mφ is a fundamental mass scale of the domain wall. We also study the behaviour of 5D fermions localized on domain walls, when two walls collide in a 5D Minkowski background spacetime. For k = 0 mode, we find that most fermions are localized on both branes as a whole even after collision. However, how much fermions are localized on which brane depends sensitively on the incident velocity and the coupling constants.

    Original languageEnglish
    Pages (from-to)90-99
    Number of pages10
    JournalProgress of Theoretical Physics Supplement
    Issue number172
    Publication statusPublished - 2008

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    domain wall
    collisions
    fermions
    velocity coupling
    gravitation
    scalars
    horizon
    flux density
    universe
    curvature
    heating

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)

    Cite this

    Collision of domain walls and creation of matter in brane world. / Maeda, Keiichi.

    In: Progress of Theoretical Physics Supplement, No. 172, 2008, p. 90-99.

    Research output: Contribution to journalArticle

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