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;