Gravitational radiation from the pulsar glitch recovery phase
University of Melbourne
Pulsar glitches are a potential source of gravitational waves. Nonaxisymmetric vortex rearrangement during a glitch and meridional circulation inside the neutron star throughout the post-glitch recovery phase emits gravitational radiation. We focus on the latter and derive the spin up flow throughout the neutron interior using a simple hydrodynamical model. The resulting gravitational wave signal depends sensitively on the properties of the neutron star interior. The signal-to-noise ratio for a coherent search suggests that the largest glitches may be detectable by future generation laser interferometer gravitational wave detectors. Furthermore, the compressibility and viscosity of the interior matter, as well as the stratification length-scale and inclination angle of the star, can be inferred in principle from a gravitational wave detection. These properties have been measured in terrestrial heavy-ion colliders but not in the many-body, low-energy regime found in neutron stars.
Date: Monday, 19 July 2010 Time: 15:00 Where: McGill University Ernest Rutherford Physics Building, room 326 Contact: Robert Rutledge