Date:

05/02/2008 - 11:30am to 12:30pm

Speaker:

Keisuke Taniguchi

Speaker affiliation:

University of Illinois

Location:

RIT, 78-2015

In this talk, I will describe our recent progress on quasiequilibrium black hole-neutron star binaries in general relativity. In our model, we solve Einstein's constraint equations in the conformal thin-sandwich decomposition together with the relativistic equations of hydrostationary equilibrium. We adopt maximal slicing, assume spatial conformal flatness, and impose equilibrium boundary conditions on an excision surface (apparent horizon) to model the black hole. In our previous treatments we adopted a ``leading-order" approximation for a parameter related to the black-hole spin in these horizon boundary conditions to construct approximately nonspinning black holes. Here we improve on the models by computing the black hole's quasilocal spin angular momentum and setting it to zero. As before, we adopt a polytropic equation of state with adiabatic index $\Gamma=2$ and assume the neutron star to be irrotational. We show results for a wide range of neutron star masses and binary mass ratios, identifying the location of the innermost stable circular orbit and the onset of the tidal disruption. Finally, we show very recent results of spinning black hole-neutron star binaries in quasiequilibrium circular orbit, and discuss how the spin of the black hole affects the location of the innermost stable circular orbit and the onset of the tidal disruption.

Home | Links | Credits | Search | Terms of Use | Disclaimer | My Account

Rochester Institute of Technology,

One Lomb Memorial Drive, Rochester, New York 14623, USA

Phone: (585) 475-7752

Fax: (585) 475-7340

Education - This is a contributing Drupal Theme

Design by WeebPal.

Design by WeebPal.