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GR: Gravitation und Relativitätstheorie

GR 10: Gravitationswellen – Quellen

GR 10.5: Vortrag

Samstag, 5. März 2005, 15:00–15:15, TU BH262

Slowly rotating relativistic star perturbations — •Isabel Rica Méndez — Institut für Astronomie und Astrophysik Universität Tübingen, D-72076 Tübingen, Germany

Compact stellar objects like neutron stars are promising candidates for gravitational wave sources. For measuring purpose it is important to determine first theoretically the frequencies of the axial and polar oscillation modes. In particular we focus on slowly rotating neutron stars. For that case we show results of the numerically calculated time-evolution of the fluid- and the metric-perturbations of the linearized Einstein field equation, thus without the frequently used Cowling approximation. The set of coupled wave equations, a first-order hyperbolic evolution system, is derived in the frame of the ADM formalism in the BCL gauge. By including also the metric-perturbations we are able to determine the error of the Cowling approximation and increase the accuracy of the resulting frequencies.