The slope, the hill, the drop, and the swoosh: Learning about the nuclear matter equation of state from the binary Love relations

Tan, Hung; Dexheimer, Veronica; Noronha-Hostler, Jacquelyn; Yunes, Nicolas

doi:10.48550/arxiv.2111.10260

Cited by 3 publications

(4 citation statements)

References 66 publications

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“…3, where we show the λa − λs correlation for the EoS and binary parameters used in this work. We can clearly see that, in line with Tan et al (2021), there is a bimodal scatter separating EoSs with backwards-and forwards-bending massradius curves. Because the binary-Love relation also depends on the neutron star radius and mass-radius slope, but with a different dependence than our two-parameter, quasi-universal relations for f 2 , combined detections of inspiral and post-merger should enable a reconstruction of the linearized mass-radius curve.…”

Section: Resultssupporting

confidence: 77%

“…These relations relate symmetric, λs = 1 2 λ1 + λ2 , and antisymmetric, λa = 1 2 λ1 − λ2 , combinations of the mass-normalized tidal deformabilities λ1,2 of the inspiralling neutron stars in an EoS-insensitive way (Yagi & Yunes 2016). In a recent work, Tan et al (2021) showed that these relations, previously thought to be fully universal, also receive an effective correction that is linearly proportional to the slope of the mass-radius curve. We illustrate this behavior in Fig.…”

Section: Resultsmentioning

confidence: 99%

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Characterizing the breakdown of quasi-universality in the post-merger gravitational waves from binary neutron star mergers

Raithel,

Most

2022

Preprint

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The post-merger gravitational wave (GW) emission from a binary neutron star merger is expected to provide exciting new constraints on the dense-matter equation of state (EoS). Such constraints rely, by and large, on the existence of quasi-universal relations, which relate the peak frequencies of the postmerger GW spectrum to properties of the neutron star structure in a model-independent way. In this work, we report on violations of existing quasi-universal relations between the peak spectral frequency, f 2 , and the stellar radius, for EoSs models with backwards-bending slopes in their mass-radius relations (such that the radius increases at high masses). The violations are extreme, with variations in f 2 of up to ∼ 600 Hz between EoSs that predict the same radius for a 1.4 M neutron star, but that have significantly different radii at higher masses. Quasi-universality can be restored by adding in a second parameter to the fitting formulae that depends on the slope of the mass-radius curve. We further find strong evidence that quasi-universality is never broken for the radii of very massive stars (with masses 2 M ). Both statements imply that f 2 is mainly sensitive to the high-density EoS. Combined with observations of the binary neutron star inspiral, these generalized quasi-universal relations can be used to simultaneously infer the characteristic radius and slope of the neutron star mass-radius relation.

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Section: Resultssupporting

confidence: 77%

Section: Resultsmentioning

confidence: 99%

Characterizing the breakdown of quasi-universality in the post-merger gravitational waves from binary neutron star mergers

Raithel,

Most

2022

Preprint

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“…Indeed, this possibility for the violation was soon also realized in non-holographic frameworks [285,286] as well. 8 See also the recent work [289], which studies generalizations of universal relations in binary systems in the presence of first order phase transitions.…”

Section: Lessons From the Deconfined Phasementioning

confidence: 99%

Holographic approach to compact stars and their binary mergers

Hoyos,

Jokela,

Vuorinen

2021

Preprint

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In this review article, we describe the role of holography in deciphering the physics of dense QCD matter, relevant for the description of compact stars and their binary mergers. We review the strengths and limitations of the holographic duality in describing strongly interacting matter at large baryon density, walk the reader through the most important results derived using the holographic approach so far, and highlight a number of outstanding open problems in the field. Finally, we discuss how we foresee holography contributing to compact-star physics in the coming years.

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“…This allows to uniquely identify the differences and similarities in compression, temperature, entropy and isospin, as well as comparing carefully the dynamical evolution of the geometry of the two systems. In this way, we can map specific microscopic initial conditions in the laboratory to macroscopic mergers consistent with previous gravitational-wave events [1,2,12], and obtain information on the properties of compact stars, such as the maximum mass [13][14][15][16], or typical radii and tidal deformabilities [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33].…”

mentioning

confidence: 99%

Probing neutron-star matter in the lab: connecting binary mergers to heavy-ion collisions

Most¹,

Motornenko²,

Steinheimer³

et al. 2022

Preprint

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As a way to find analogies and differences in the dynamics of hot and dense matter under extreme conditions, we present the first self-consistent relativistic-hydrodynamic calculations of both neutron-star mergers and lowenergy heavy-ion collisions employing the same equation of state. By a direct comparison of the evolution of quantities such as temperature, entropy, and density, we show that neutron-star collision regimes can be probed directly at GSI beam energies. We provide concrete evidence that the physical conditions reached in binary neutron-star mergers can be studied in present and future laboratory experiments, thus bridging 18 orders of magnitude in length scale, from microscopic ion collisions to macroscopic astrophysical compact objects.

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The slope, the hill, the drop, and the swoosh: Learning about the nuclear matter equation of state from the binary Love relations

Cited by 3 publications

References 66 publications

Characterizing the breakdown of quasi-universality in the post-merger gravitational waves from binary neutron star mergers

Characterizing the breakdown of quasi-universality in the post-merger gravitational waves from binary neutron star mergers

Holographic approach to compact stars and their binary mergers

Probing neutron-star matter in the lab: connecting binary mergers to heavy-ion collisions

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