[SEMINARI] Nonlinear damping of neutron star oscillations

[Enric Marco]

Title: Nonlinear damping of neutron star oscillations

by: Wolfgang Kastaun

From: Albert Einstein Institut (Alemanya)

Where: Seminari del departament d'Astronomia i Astrofísica

Date: Divendres 24 febrer 2012

Hour: 15:00

Resum

Oscillations of neutron stars are a possible source of detectable
gravitational waves due to the existence of a gravitational-rotational
instability which transfers energy from the rotation of a star into
gravitational waves and oscillation energy. There are however several
effects that could suppress the growth of those instabilities already
at low amplitudes, e.g. viscosity, mode coupling, or superfluidity
effects. Those mechanisms depend on physical parameters not exactly
known and/or are difficult to estimate even for given parameters due
to the long timescales involved. We instead investigated generic
hydrodynamic effects active at very high amplitudes, such as shock
formation or breaking of surface waves, in order to provide absolute
upper limits on the gravitational wave luminosity of oscillating
neutron stars.

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Dr. Enric Marco
Departament d'Astronomia i Astrofísica
Facultat de Física
Universitat de València
C/  Dr. Moliner, 50
46100 Burjassot, Spain
Phone: (34)-96-354-3069
Fax:(34)-96-354-3084
enric.marco en uv.es
www.uv.es/marco
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