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Alfvén QPOs in Magnetars
Hajime Sotani, Kostas Kokkotas, Nikolaos Stergioulas
We investigate torsional Alfvén oscillations of relativistic stars with a global dipole magnetic field, via two-dimensional numerical simulations. We find that a) there exist two f…
Fragmentation of general relativistic quasi-toroidal polytropes
Burkhard Zink, Nikolaos Stergioulas, Ian Hawke +3
We investigate the role of rotational instabilities in the context of black hole formation in relativistic stars. In addition to the standard scenario - an axially symmetric dynami…
Gravitational Waves from Nonlinear Couplings of Radial and Polar Nonradial Modes in Relativistic Stars
Andrea Passamonti, Nikolaos Stergioulas, Alessandro Nagar
The post-bounce oscillations of newly-born relativistic stars are expected to lead to gravitational-wave emission through the excitation of nonradial oscillation modes. At the same…