Gravitational waves from collapsing stars

Gravitational Waves from Collapsing Vacuum Domains

The breaking of an approximate discrete symmetry, the final stages of a first order phase transition, or a postinflationary biased probability distribution for scalar fields are possible cosmological scenarios characterized by the presence of unstable domain wall networks. Combining analytical and numerical techniques, we show that the non-spherical collapse of these domains can be a powerful s...

Gravitational waves from neutron stars

Gravitational Waves from Relativistic Stars

The amplitude of gravitational waves is quite tiny, although they carry enormous amount of energy. They propagate without suffering any disturbance after leaving the sources. The observation gives the direct information of the emission regions. The gravitational wave astronomy in the next century will therefore be an invaluable tool to diagnose the interior structure of the relativistic stars. ...

Gravitational Waves from Rotating Proto-Neutron Stars

We study the effects of rotation on the quasi normal modes (QNMs) of a newly born proto neutron star (PNS) at different evolutionary stages, until it becomes a cold neutron star (NS). We use the Cowling approximation, neglecting spacetime perturbations, and consider different models of evolving PNS. The frequencies of the modes of a PNS are considerably lower than those of a cold NS, and are fu...

Detecting gravitational waves from accreting neutron stars

The gravitational waves emitted by neutron stars carry unique information about their structure and composition. Direct detection of these gravitational waves, however, is a formidable technical challenge. In a recent study we quantified the hurdles facing searches for gravitational waves from the known accreting neutron stars, given the level of uncertainty that exists regarding spin and orbit...