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GR: Fachverband Gravitation und Relativitätstheorie

GR 12: Astrophysik

GR 12.3: Vortrag

Mittwoch, 17. März 2010, 16:00–16:20, JUR K

On the frequency band of the f-mode CFS instability — •Burkhard Zink¹, Oleg Korobkin², Erik Schnetter², and Nikolaos Stergioulas³ — ¹Theoretische Astrophysik, Eberhard-Karls-Universität Tübingen — ²Center for Computation and Technology, Louisiana State University, Baton Rouge, LA, USA — ³Department of Physics, Section of Astrophysics, Astronomy and Mechanics Aristotle University of Thessaloniki, Thessaloniki, Greece

Rapidly rotating neutron stars can be unstable to the CFS mechanism if they have a neutral point in the spectrum of nonaxisymmetric f-modes. We investigate the frequencies of these modes in two sequences of uniformly rotating polytropes using nonlinear simulations in full general relativity, determine the approximate locations of the neutral points, and derive limits on the observable frequency band available to the instability in these sequences.