Can gravity perturbations explain QPOs?

Details Can gravity perturbations explain QPOs? Can gravity perturbations explain QPOs?

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aipc..924..911m&link_type=abstract

THE MULTICOLORED LANDSCAPE OF COMPACT OBJECTS AND THEIR EXPLOSIVE ORIGINS. AIP Conference Proceedings, Volume 924, pp. 911-914

Physics

Accretion And Accretion Disks, Relativity And Gravitation, Black Holes, Neutron Stars

Scientific paper

We show the results of some numerical simulations trying to reproduce the QPO behavior in black hole and neutron star sources. Our simulations are based on the idea that a nearly periodic luminosity oscillation can be obtained from a perturbation of the source gravitational field with a sinusoidal time behavior. We find that some specific features of the QPO phenomenon can be described by this simple model, but the required amplitude of the gravity perturbation is more than 1% of the unperturbed gravitational field. If the hypothesis is formed that such a perturbation is due to a density fluctuation (of the accretion disk or the source itself, in the case of the neutron star) going around the source gravity center, a minimal perturbation amplitude of the 1% appears too large to be considered physically realistic in the known framework of compact sources. Our conclusion is therefore that this model needs further theoretical study and probably additional `ingredients' and hypothesis.

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