Radiation from collapsing relativistic stars. III - Second order perturbations of collapse with rotation

Astronomy and Astrophysics – Astrophysics

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Gravitational Collapse, Gravitational Waves, Relativistic Effects, Stellar Radiation, Stellar Rotation, Astrophysics, Differential Equations, Perturbation Theory, Quadrupoles

Scientific paper

We study the gravitational waves generated during the collapse of a slowly rotating, pressureless, constant density star. To first order in the rotation rate the perturbation is an odd-parity dipole and generates no gravitational waves. The first order perturbation, however, drives a quadrupole deformation which is second order in the rotation rate and which produces the radiation. Using a gauge invariant description, we derive the equations governing this second order perturbation. These equations are then applied to the case of the collapse of a slowly and uniformly rotating constant-density star following the sudden turnoff of pressure. Numerical results are given for the gravitational waveforms and energies generated.

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