The physics of kHz QPOs---strong gravity's coupled anharmonic oscillators

Details The physics of kHz QPOs---strong gravity's coupled anharmonic oscillators The physics of kHz QPOs---strong gravity's coupled anharmonic oscillators

2001-05-03

arxiv.org/abs/astro-ph/0105057v1

Astronomy and Astrophysics

Astrophysics

Scientific paper

We explain the origin of the puzzling high frequency peaks (QPOs) in the variability power spectra of accreting neutron stars and black holes as a non-linear 1:2 or 1:3 resonance between orbital and radial epicyclic motion. These resonances are present because the gravitational field deviates strongly from a Newtonian 1/r potential. Our theory agrees with the recently reported observations of two QPOs, at 300 Hz and 450 Hz, in the black hole candidate GRO J1655-40.

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