On the frequency band of the f-mode CFS instability

Details On the frequency band of the f-mode CFS instability On the frequency band of the f-mode CFS instability

2010-03-03

arxiv.org/abs/1003.0779v1

Phys.Rev.D81:084055,2010

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

13 pages, 9 figures

Scientific paper

10.1103/PhysRevD.81.084055

Rapidly rotating neutron stars can be unstable to the gravitational-wave-driven CFS mechanism if they have a neutral point in the spectrum of nonaxisymmetric f-modes. We investigate the frequencies of these modes in two sequences of uniformly rotating polytropes using nonlinear simulations in full general relativity, determine the approximate locations of the neutral points, and derive limits on the observable frequency band available to the instability in these sequences. We find that general relativity enhances the detectability of a CFS-unstable neutron star substantially, both by widening the instability window and enlarging the band into the optimal range for interferometric detectors like LIGO, VIRGO, and GEO-600.

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