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

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.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0014-5D2E-4 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-3B09-D
Genre: Journal Article

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Haskell, Brynmor, Author
Ciolfi, Riccardo, Author
Pannarale, Francesco1, Author              
Rezzolla, Luciano1, Author              
Affiliations:
1Astrophysical Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_24013              

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Free keywords: Astrophysics, Solar and Stellar Astrophysics, astro-ph.SR,General Relativity and Quantum Cosmology, gr-qc
 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.

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 Dates: 2013-09-162014
 Publication Status: Published in print
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 Identifiers: arXiv: 1309.3885
DOI: 10.1093/mnrasl/slt161
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Title: Monthly Notices of the Royal Astronomical Society: Letters
  Other : Mon. Not. Roy. Astron. Soc.: Letters
Source Genre: Journal
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Publ. Info: Oxford : Blackwell Science
Pages: - Volume / Issue: 438 Sequence Number: - Start / End Page: L71 - L75 Identifier: ISSN: 1745-3925
CoNE: /journals/resource/1000000000021470