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On the universality of I-Love-Q relations in magnetized neutron stars

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons4562

Pannarale,  Francesco
Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons20670

Rezzolla,  Luciano
Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society;

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Fulltext (public)

1309.3885.pdf
(Preprint), 373KB

mnrasl.slt161.full.pdf
(Any fulltext), 286KB

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Citation

Haskell, B., Ciolfi, R., Pannarale, F., & Rezzolla, L. (2014). On the universality of I-Love-Q relations in magnetized neutron stars. Monthly Notices of the Royal Astronomical Society: Letters, 438, L71-L75. doi:10.1093/mnrasl/slt161.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0014-5D2E-4
Abstract
Recently, general relations among the quadrupole moment (Q), the moment of inertia (I), and the tidal deformability (Love number) of a neutron star were shown to exist. They are nearly independent of the nuclear matter equation of state and would be of great aid in extracting parameters from observed gravitational-waves and in testing general relativity. These relations, however, do not account for strong magnetic fields. We consider this problem by studying the effect of a strong magnetic field on slowly rotating relativistic neutron stars and show that, for simple magnetic field configurations that are purely poloidal or purely toroidal, the relation between Q and I is again nearly universal. However, different magnetic field geometries lead to different I-Q relations, and, in the case of a more realistic twisted-torus magnetic field configuration, the relation depends significantly on the equation of state, losing its universality. I-Love-Q relations must thus be used with very great care, since universality is lost for stars with long spin periods, i.e. P > 10 s, and strong magnetic fields, i.e. B > 10^12 G.