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

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.

Published as MNRAS Letters 438, L71-L75 (2014)

References in corpus (8)

• Modelling magnetically deformed neutron stars
• Twisted-torus configurations with large toroidal magnetic fields in relativistic stars
• Maximum gravitational-wave energy emissible in magnetar flares
• Hydromagnetic Instabilities in Neutron Stars
• Variability from Nonaxisymmetric Fluctuations Interacting with Standing Shocks in Tilted Black Hole Accretion Disks
• Relativistic stars with purely toroidal magnetic fields
• The contrasting magnetic fields of superconducting pulsars and magnetars
• Gravitational Waves and Hydromagnetic Instabilities in Rotating Magnetized Neutron Stars

Cited by in corpus (94)

• Testing General Relativity with Present and Future Astrophysical Observations
• New constraints on radii and tidal deformabilities of neutron stars from GW170817
• Approximate Universal Relations for Neutron Stars and Quark Stars
• Maximum mass, moment of inertia and compactness of relativistic stars
• Spectral properties of the post-merger gravitational-wave signal from binary neutron stars
• Gravitational waves from neutron star mergers and their relation to the nuclear equation of state
• Rotating Stars in Relativity
• No-hair theorem for Black Holes in Astrophysical Environments
• Rotational properties of hypermassive neutron stars from binary mergers
• I-Love-Q, Spontaneously: Slowly Rotating Neutron Stars in Scalar-Tensor Theories
• Effective No-Hair Relations for Neutron Stars and Quark Stars: Relativistic Results
• Effectively universal behavior of rotating neutron stars in general relativity makes them even simpler than their Newtonian counterparts
• I-Q relation for rapidly rotating neutron stars
• Tidal Love numbers of a slowly spinning neutron star
• Tidal deformation of a slowly rotating material body. External metric
• Testing universal relations of neutron stars with a nonlinear matter-gravity coupling theory
• Interpreting Binary Neutron Star Mergers: Describing the Binary Neutron Star Dynamics, Modelling Gravitational Waveforms, and Analyzing Detections
• Multipolar universal relations between f-mode frequency and tidal deformability of compact stars
• I-Love-Q relations for a gravastar and the approach to the black-hole limit
• Heavy Baryons in Compact Stars
• Inferring neutron star properties from GW170817 with universal relations
• Tidal deformation of a slowly rotating black hole
• Dark stars: gravitational and electromagnetic observables
• Why I-Love-Q
• I-Love-Q anisotropically: Universal relations for compact stars with scalar pressure anisotropy
• Neutron star equation of state: QMF modeling and applications
• Rotating proto-neutron stars: spin evolution, maximum mass and I-Love-Q relations
• Probing the Internal Composition of Neutron Stars with Gravitational Waves
• Three-Hair Relations for Rotating Stars: Nonrelativistic Limit
• The I-Q relations for rapidly rotating neutron stars in $f(R)$ gravity
• Simulations of inspiraling and merging double neutron stars using the Spectral Einstein Code
• Gravitational wave asteroseismology of neutron and strange stars in $R^2$ gravity
• Multipole moments in scalar-tensor theory of gravity
• Relativistic theory of surficial Love numbers
• Universal relations for rapidly rotating cold and hot hybrid star
• $I-$Love$-C$ relation for an anisotropic neutron star
• Gravitomagnetic tidal effects in gravitational waves from neutron star binaries
• Unveiling the universality of I-Love-Q relations
• Moment of inertia -- compactness universal relations in scalar-tensor theories and ${\mathcal{R}}^2$ gravity
• Holographic approach to compact stars and their binary mergers
• Tidal deformation of a slowly rotating material body: Interior metric and Love numbers
• Toward Realistic and Practical No-Hair Relations for Neutron Stars in the Non-Relativistic Limit
• Mass-Radius Relation of Strongly Magnetized White Dwarfs: Dependence on Field Geometry, GR effects and Electrostatic Corrections to the EOS
• Dynamical response to a stationary tidal field
• Improved Universality in the Neutron Star Three-Hair Relations
• I-Love relation for incompressible stars and realistic stars
• Relating Follicly-Challenged Compact Stars to Bald Black Holes
• Moment of inertia, quadrupole moment, Love number of neutron star and their relations with strange matter equations of state
• Two-layer compact stars with crystalline quark matter: Screening effect on the tidal deformability
• Rotating dark matter admixed neutron stars
• Dense Matter in Neutron Stars with eXTP
• Testing modified gravity and no-hair relations for the Kerr-Newman metric through quasi-periodic oscillations of galactic microquasars
• Spin and quadrupole contributions to the motion of astrophysical binaries
• Moment of inertia - mass universal relations for neutron stars in scalar-tensor theory with self-interacting massive scalar field
• Universal Relations and Alternative Gravity Theories
• Universal relations for compact stars with heavy baryons
• Universality and stationarity of the I-Love relation for self-bound stars
• The I-Love-Q Relations for Superfluid Neutron Stars
• Universal relations for rotating Boson Stars
• Completion of the universal I-Love-Q relations in compact stars including the mass
• Tidal deformability and gravitational-wave phase evolution of magnetised compact-star binaries
• Investigating the I-Love-Q and w-mode Universal Relations Using Piecewise Polytropes
• The heavier the better: how to constrain mass ratios and spins of high-mass neutron-star mergers
• Epicyclic oscillations in the Hartle-Thorne external geometry
• Universal relations for compact stars with exotic degrees of freedom
• Effects of hadron-quark phase transition on properties of Neutron Stars
• An Entropy-Area Law for Neutron Stars Near the Black Hole Threshold
• Universal behavior of compact star based upon gravitational binding energy
• I-Love-Q to the extreme
• Constructing Love-Q-Relations with Gravitational Wave Detections
• Critical mass, moment of inertia and universal relations of rapidly rotating neutron stars with exotic matter
• Universal Relations for rapidly rotating neutron stars using supervised machine-learning techniques
• Nonvalidity of I-Love-Q Relations for Hot White Dwarf Stars
• Modelling the Magnetic Field Configuration of Neutron Stars
• Prospect of unraveling the first-order phase transition in neutron stars with $f$ and $p_1$ modes
• Quasi-universal relations in the context of future neutron star detections
• Universal Relations For Generic Family Of Neutron Star Equations Of State
• A tight universal relation between the shape eccentricity and the moment of inertia for rotating neutron stars
• Electromagnetically-Induced Frame-Dragging around Astrophysical Objects
• Investigating the role of nuclear parameters on oscillation modes in hot Neutron Stars
• Universal relations to measure neutron star properties from targeted r-mode searches
• Four-Hair Relations for Differentially Rotating Neutron Stars in the Weak-Field Limit
• Constraining the Surface Curvature of an Anisotropic Neutron Star
• Compact star deformation and universal relationship for magnetized white dwarfs
• Dark I-Love-Q
• I-C-Q relations for rapidly rotating stable hybrid stars
• Insights into Binary Neutron Star Merger Simulations: A Multi-Code Comparison
• Effect of symmetry energy on properties of rapidly rotating neutron stars and universal relations
• I-Love irrotationally
• Inferring neutron star properties through gravitational waves from r-modes and their relativistic counterparts
• Equation-of-State Independent Relations in Rapidly Rotating Hybrid Stars
• I-Love-Q Relations of Fermion-Boson Stars
• Rotation-dependent $I$-Love-$Q$-$\delta M$ relations in perturbation theory
• Predictions on observing hot holographic quark star with gravitational waves