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    Neutrino trapping in braneworld extremely compact stars

    Zdeněk Stuchlík · 01 listopadu, 2011 · Fyzika · 0 comments
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    Publication date: Nov 2011

    Abstract:
    Extremely Compact Stars (ECS) contain trapped null geodesics. When such
    objects enter the evolution period admitting geodetical motion of
    neutrinos, certain part of neutrinos produced in their interior will be
    trapped influencing their neutrino luminosity and thermal evolution. We
    study neutrino trapping in the braneworld ECS, assuming uniform
    distribution of neutrino emissivity and massless neutrinos. We give the
    efficiency of the neutrino trapping effects in the framework of the
    simple model of the internal spacetime with uniform distribution of
    energy density, and external spacetime described by the
    Reissner-Nordström geometry characterized by the braneworld "tidal"
    parameter b. For b < 0 the external spacetime is of the black-hole
    type, while for b > 0 the external spacetime can be of both
    black-hole and naked-singularity type. Then the ECS surface radius R can
    be located also above the unstable (outer) photon circular orbit. Such
    basically new types of the spacetimes strongly alter the trapping
    phenomena as compared to the standard case of b = 0. It is shown that
    the neutrino trapping effects are slightly lowered by the presence of
    physically more plausible case of b < 0, as compared to the standard
    internal Schwarzschild spacetime, while they can be magnified by
    positive tidal charges if b < 1 and lowered for b > 1. However,
    potential astrophysical relevance of the trapping phenomena is strongly
    enhanced for negative tidal charges enabling a significant enlargement
    of the ECS surface radius to values coherent with recent observations.

    Authors:
    Stuchlík, Zdeněk; Hladík, Jan; Urbanec, Martin;

    http://adsabs.harvard.edu/abs/2011GReGr..43.3163S

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