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    Quasiperiodic oscillations in a strong gravitational field around neutron stars testing braneworld models

    Zdeněk Stuchlík · Listopad 01, 2008 · Fyzika · 0 comments
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    Publication date: Nov 2008

    Abstract:
    The strong gravitational field of neutron stars in the brany universe
    could be described by spherically symmetric solutions with a metric in
    the exterior to the brany stars being of the Reissner Nordström
    type containing a brany tidal charge representing the tidal effect of
    the bulk spacetime onto the star structure. We investigate the role of
    the tidal charge in orbital models of high-frequency quasiperiodic
    oscillations (QPOs) observed in neutron star binary systems. We focus on
    the relativistic precession model. We give the radial profiles of
    frequencies of the Keplerian (vertical) and radial epicyclic
    oscillations. We show how the standard relativistic precession model
    modified by the tidal charge fits the observational data, giving
    estimates of the allowed values of the tidal charge and the brane
    tension based on the processes going in the vicinity of neutron stars.
    We compare the strong field regime restrictions with those given in the
    weak-field limit of solar system experiments.

    Authors:
    Kotrlová, Andrea; Stuchlík, Zdeněk; Török, Gabriel;

    http://adsabs.harvard.edu/abs/2008CQGra..25v5016K

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