Mapping the Spacetimes of Neutron Stars with Quasi-Periodic Oscillations

Details Mapping the Spacetimes of Neutron Stars with Quasi-Periodic Oscillations Mapping the Spacetimes of Neutron Stars with Quasi-Periodic Oscillations

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003head....7.1902d&link_type=abstract

American Astronomical Society, HEAD meeting #7, #19.02; Bulletin of the American Astronomical Society, Vol. 35, p.632

Astronomy and Astrophysics

Astronomy

Scientific paper

The frequencies of quasi-periodic oscillations around neutron stars are believed to be related to characteristic frequencies in the gravitational fields of the compact objects. In different variability models, these include the Keplerian, epicyclic, and Lense-Thirring frequencies, which depend mostly on the properties of the stellar spacetimes. In this talk, I will argue that quasi-periodic oscillations in the X-ray flux of neutron stars can be used to map the external spacetimes of the compact objects and, therefore, lead to direct tests of general relativity in the strong-field regime. In particular, I will show that extensions of general relativity, in which the gravitational force felt by matter is mediated by both a rank-two tensor and a scalar field, can be severely constrained by current observations.

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