Speaker
Dr
Juergen Schaffner-Bielich
(Institut fuer Theoretische Physik, Goethe Universitaet, Frankfurt)
Description
In the dense interior of compact stars the composition might change
considerably. Due to weak equilibrium in neutron star matter particles
carrying strangeness can appear changing the overall global properties as well
as the transport properties of compact stars. The new pulsar mass limit of two
solar masses gives new information on the presence of strange matter in the
core of compact stars. New degrees of freedom, as strangeness, usually soften
the nuclear equation of state, thereby reducing the maximum mass
possible. Certain classes of microscopic models including hyperons face the
problem that the maximum mass is well below the two solar mass limit, which is
the so called 'hyperon puzzle', while other nuclear models describing
hypernuclear properties result in neutron star masses of two solar masses or
more. As a possible reconciliation of the hyperon puzzle, the presence of
strange quark matter stabilizing the core of neutron stars have been
invoked. The implications of the new pulsar mass limit on the parameters of
the hypernuclear models as well as of quark matter models will be discussed
in the presentation.
Author
Dr
Juergen Schaffner-Bielich
(Institut fuer Theoretische Physik, Goethe Universitaet, Frankfurt)
