Gravitational Waves from Color-Magnetic “Mountains” in Neutron Stars

Glampedakis, Kostas; Jones, D. I.; Samuelsson, Lars

doi:10.1103/physrevlett.109.081103

Cited by 30 publications

(41 citation statements)

References 27 publications

(50 reference statements)

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“…Equivalent ellipticities of ∼10 −6 are achievable by r-mode amplitudes of a few times 10 −4 [7,44,54]. Our upper limit approaches the ellipticity predicted for certain exotic equations of state [55][56][57].…”

Section: Discussionsupporting

confidence: 66%

Directed search for gravitational waves from Scorpius X-1 with initial LIGO data

Aasi¹,

Abbott²,

Abbott³

et al. 2015

Phys. Rev. D

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We present results of a search for continuously-emitted gravitational radiation, directed at the brightest lowmass X-ray binary, Scorpius X-1. Our semi-coherent analysis covers 10 days of LIGO S5 data ranging from 50-550 Hz, and performs an incoherent sum of coherent F -statistic power distributed amongst frequencymodulated orbital sidebands. All candidates not removed at the veto stage were found to be consistent with noise at a 1% false alarm rate. We present Bayesian 95% confidence upper limits on gravitational-wave strain amplitude using two different prior distributions: a standard one, with no a priori assumptions about the orientation of Scorpius X-1; and an angle-restricted one, using a prior derived from electromagnetic observations. Median strain upper limits of 1.3×10−24 and 8×10 −25 are reported at 150 Hz for the standard and angle-restricted searches respectively. This proof of principle analysis was limited to a short observation time by unknown effects of accretion on the intrinsic spin frequency of the neutron star, but improves upon previous upper limits by factors of ∼1.4 for the standard, and 2.3 for the angle-restricted search at the sensitive region of the detector.

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Section: Discussionsupporting

confidence: 66%

Directed search for gravitational waves from Scorpius X-1 with initial LIGO data

Aasi¹,

Abbott²,

Abbott³

et al. 2015

Phys. Rev. D

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“…A simple way to approximate the ellipticity of a superconducting star is to take a result for normal matter and scale it up by a factor H c1 /B, taking H c1 = 10 15 G. Comparing our ellipticity formulae (15) and (16), both from self-consistent calculations, we see that for a given B s this approach would underestimate the star's distortion by around 30%. Choosing M N (u) as a higher power of u increases the ratio of average internal fieldB to B s and hence the ellipticity at a fixed value of B s .…”

mentioning

confidence: 89%

“…The innermost part of the core may exhibit type-I superconductivity [12,13], with large regions of alternating normal and superconducting matter; the effect of this on the global magnetic field is unknown at present. Alternatively, the star's hadronic matter could give way to an inner core of 'colour superconducting' quark matter [14,15].…”

mentioning

confidence: 99%

Magnetic Fields in Superconducting Neutron Stars

Lander

2013

Phys. Rev. Lett.

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The interior of a neutron star is likely to be predominantly a mixture of superfluid neutrons and superconducting protons. This results in the quantisation of the star's magnetic field into an array of thin fluxtubes, producing a macroscopic force very different from the Lorentz force of normal matter. We show that in an axisymmetric superconducting equilibrium the behaviour of a magnetic field is governed by a single differential equation. Solving this, we present the first self-consistent superconducting neutron star equilibria with poloidal and mixed poloidal-toroidal fields, also giving the first quantitative results for the corresponding magnetically-induced distortions to the star. The poloidal component is dominant in all our configurations. We suggest that the transition from normal to superconducting matter in a young neutron star may cause a large-scale field rearrangement.PACS numbers: 97.60. Jd, 74.25.Ha, 95.30.Qd

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“…Our calculation provides a quantitative, numerical calculation of the flux tube energy, putting the estimates used in Ref. [31] on solid ground. It also slightly changes this estimate due to the new flux tube configuration, although this change is small compared to the uncertainties involved in the estimate of the ellipticity of the star.…”

Section: Astrophysical Implicationsmentioning

confidence: 99%

New color-magnetic defects in dense quark matter

Haber

Schmitt

2018

J. Phys. G: Nucl. Part. Phys.

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Color-flavor locked (CFL) quark matter expels color-magnetic fields due to the Meissner effect. One of these fields carries an admixture of the ordinary abelian magnetic field and therefore flux tubes may form if CFL matter is exposed to a magnetic field, possibly in the interior of neutron stars or in quark stars. We employ a Ginzburg-Landau approach for three massless quark flavors, which takes into account the multi-component nature of color superconductivity. Based on the weakcoupling expressions for the Ginzburg-Landau parameters, we identify the regime where CFL is a type-II color superconductor and compute the radial profiles of different color-magnetic flux tubes. Among the configurations without baryon circulation we find a new solution that is energetically preferred over the flux tubes previously discussed in the literature in the parameter regime relevant for compact stars. Within the same setup, we also find a new defect in the 2SC phase, namely magnetic domain walls, which emerge naturally from the previously studied flux tubes if a more general ansatz for the order parameter is used. Color-magnetic defects in the interior of compact stars allow for sustained deformations of the star, potentially strong enough to produce detectable gravitational waves. * Electronic address: ahaber@hep.itp.tuwien.ac.at † Electronic address: a.schmitt@soton.ac.uk

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Gravitational Waves from Color-Magnetic “Mountains” in Neutron Stars

Cited by 30 publications

References 27 publications

Directed search for gravitational waves from Scorpius X-1 with initial LIGO data

Directed search for gravitational waves from Scorpius X-1 with initial LIGO data

Magnetic Fields in Superconducting Neutron Stars

New color-magnetic defects in dense quark matter

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