[SEMINARI]: LINEAR AND NOLINEAR DYNAMICS OF "TOROIDAL NEUTRON STARS

[Arcadi Santamaria i Luna]

  -------- Original Message --------
Subject: [SEMINARI] LINEAR AND NOLINEAR DYNAMICS OF "TOROIDAL NEUTRON STARS
Date: Tue, 25 Mar 2003 13:12:29 +0000
From: Enric Marco <Enric.Marco en uv.es>
Organization: Universitat de València
To: daa en uv.es, Arcadi.Santamaria en uv.es



Lugar: Seminario del DAA
Dia: Jueves 3 de Abril
Hora: 12:00

        LINEAR AND NOLINEAR DYNAMICS OF "TOROIDAL NEUTRON STARS"

                         Luciano Rezzolla

             SISSA, International School for Advanced Studies, Trieste


I present axisymmetric  general relativistic hydrodynamics simulations
of constant angular momentum compact discs orbiting a  Schwarzschild
black
 hole.  These discs  are expected  as  a result  of stellar
gravitational collapse or  binary neutron  star merger, can  reach very
high
rest-mass densities  and  behave effectively  as  ``toroidal  neutron
stars''.
Our attention is here focussed on  the dynamical response of these
objects
to perturbations. I show that, upon the introduction of perturbations,
these systems either become  unstable to the run-away instability  or
exhibit
a strikingly regular oscillatory behaviour  resulting in a
quasi-periodic
 variation  of  the  mass  accretion  rate  as  well  as  of  the
density distribution. Despite being  axisymmetric, the perturbed discs
experience large   variations   of  the   rest-mass   distribution
hence
emitting considerable  amounts of  gravitational  radiation. The
strength of
the gravitational waves emitted  can be up to two  orders of magnitude
larger than the one  expected in stellar-core collapse making these new
sources of gravitational waves potentially detectable.





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