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Alfv\'en Polar Oscillations of Relativistic Stars

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arxiv 0902.1490 v2 pith:SY474VPV submitted 2009-02-09 astro-ph.HE gr-qc

classification astro-ph.HEgr-qc
keywords oscillationsalfvpolarfieldmagneticmodesrelativisticspectrum
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We study polar Alfv\'en oscillations of relativistic stars endowed with a strong global poloidal dipole magnetic field. Here we focus only on the axisymmetric oscillations which are studied by evolving numerically the two-dimensional perturbation equations. Our study shows that the spectrum of the polar Alfv\'{e}n oscillations is discrete in contrast to the spectrum of axial Alfv\'{e}n oscillations which is continuous. We also show that the typical fluid modes, such as the f and p modes, are not significantly affected by the presence of the strong magnetic field.

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  1. Magnetic effects on fundamental modes in rotating neutron stars with a purely toroidal magnetic field

    astro-ph.HE 2025-09 conditional novelty 6.0 of 10

    Even with both rotation and a toroidal magnetic field, neutron star fundamental-mode frequencies stay quasi-linear in compactness and T/|W|, with magnetization-dependent slopes, and the f_2f/f_F ratio can help constra...

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