Coupling of radial and non-radial oscillations of Neutron stars

Details Coupling of radial and non-radial oscillations of Neutron stars Coupling of radial and non-radial oscillations of Neutron stars

2004-11-03

arxiv.org/abs/gr-qc/0411021v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

4 pages. Proceedings of the NATO Advanced Study Institute on the Electromagnetic Spectrum of Neutron Stars, Marmaris, Turkey,

Scientific paper

This is a progress report on our study of the coupling of first-order radial and non-radial relativistic perturbations of a static spherical star. Our goal is to investigate the effects of this coupling on the gravitational wave signal of neutron stars. In particular, we are looking for the existence of resonances and parametric amplifications, changes in the damping time of non-radial oscillations, etc. To that end, we have developed a formalism that introduces gauge invariant quantities to describe the coupling. Their equations have the same structure as the equations for first-order non-radial perturbations plus some source terms, which makes them very appealing for time domain studies.

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