Critical examination of constraints on the equation of state of dense matter obtained from GW170817

By I. Tews, J. Margueron, S. Reddy. Physical Review C, 2018

207 citations recorded by the source corpus.

The correlation of the tidal polarizabilities Λ1-Λ2 for GW170817 is predicted by combining dense-matter equations of state (EOSs) that satisfy nuclear physics constraints with the chirp mass and mass asymmetry for this event. Our models are constrained by calculations of the neutron-matter EOS using chiral effective field theory Hamiltonians with reliable error estimates up to once or twice the nuclear saturation density. In the latter case, we find that GW170817 does not improve our understanding of the EOS. We contrast two distinct extrapolations to higher density: a minimal model (MM) which assumes that the EOS is a smooth function of density described by a Taylor expansion and a more general model parametrized by the speed of sound that admits phase transitions. This allows us to identify regions in the Λ1-Λ2 plots that could favor the existence of new phases of matter in neutron stars. We predict the combined tidal polarizability of the two neutron stars in GW170817 to be 80≤Λ≤580 (280≤Λ≤480 for the MM), which is smaller than the range suggested by the LIGO-Virgo data analysis. Our analysis also shows that GW170817 requires a NS with M=1.4M⊙ to have a radius 9.0km

Subfields: Astronomy and Astrophysics, Geophysics

View Paper: https://www.semanticscholar.org/paper/09300a9d917ff1146ef80c23a779c8dfc75ac138

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Citations in the corpus

Binary Neutron Star Mergers: Mass Ejection, Electromagnetic Counterparts, and Nucleosynthesis (2018, background): “…2018; Malik et al. 2018; Most et al. 2018b; Nandi et al. 2018; Paschalidis et al. 2018; Radice et al. 2018c; Rezzolla et al. 2018; Ruiz et al. 2018; Tews et al. 2018; Tsang et al. 2018; Wei et al. 2018), and the origin of short γ-ray bursts (SGRBs; Abbott et al. 2017c; Mooley et al. 2018a;…”
Equation of state sensitivities when inferring neutron star and dense matter properties (2018, methodology): “(2) The form of our CS parametrization is very similar to the one used by Tews et al. (2018b).”
Constraining the Dense Matter Equation of State with Joint Analysis of NICER and LIGO/Virgo Measurements (2019, result): “The results were consistent, leading to R = 11.9+1.4−1.4 km from the spectral EOS analysis and R = 10.8+2.0−1.7 km for the more massive NS at the 90% credible interval (Abbott et al. 2018); see also De et al. (2018); Annala et al. (2018); Tews et al. (2018) for independent related work.”
A NICER View of PSR J0030+0451: Millisecond Pulsar Parameter Estimation (2019, methodology): “…deformability constraints derived from analysis of the NS binary merger event GW170817 (Abbott et al. 2018; Annala et al. 2018; Most et al. 2018; Tews et al. 2018b; Lim & Holt 2018; Malik et al. 2018; Carson et al. 2019; Li & Sedrakian 2019; Montaña et al. 2019), and consideration is already…”
A NICER View of PSR J0030+0451: Implications for the Dense Matter Equation of State (2019, methodology): “Following the methods described in Greif et al. (2019), we model the interior of PSRJ0030+0451 using two distinct EoS parameterizations: the piecewise-polytropic (PP) model from Hebeler et al. (2013) and a speed of sound (CS) model introduced in Greif et al. (2019)—see also Tews et al. (2018a).”