TY - JOUR
T1 - Updated universal relations for tidal deformabilities of neutron stars from phenomenological equations of state
AU - Godzieba, Daniel A.
AU - Gamba, Rossella
AU - Radice, David
AU - Bernuzzi, Sebastiano
N1 - Funding Information:
It is a pleasure to acknowledge B. Sathyaprakash for discussions. D. R. acknowledges support from the U.S. Department of Energy, Office of Science, Division of Nuclear Physics under Award No. DE-SC0021177 and from the National Science Foundation under Grant No. PHY-2011725. R. G. acknowledges support from the Deutsche Forschungsgemeinschaft (DFG) under Grant No. 406116891 within the Research Training Group RTG 2522/1. S. B. acknowledges support by the EU H2020 under ERC Starting Grant No. BinGraSp-714626. Computations for this research were performed on the Pennsylvania State University’s Institute for Computational and Data Sciences Advanced CyberInfrastructure (ICDS-ACI). This research has made use of data, software and/or web tools obtained from the Gravitational Wave Open Science Center , a service of LIGO Laboratory, the LIGO Scientific Collaboration and the Virgo Collaboration. LIGO is funded by the U.S. National Science Foundation. Virgo is funded by the French Centre National de Recherche Scientifique (CNRS), the Italian Istituto Nazionale della Fisica Nucleare (INFN) and the Dutch Nikhef, with contributions by Polish and Hungarian institutes.
Publisher Copyright:
© 2021 American Physical Society.
PY - 2021/3/25
Y1 - 2021/3/25
N2 - Equation of state (EOS) insensitive relations, so-called universal relations, between the neutron star (NS) compactness, its multipolar tidal deformability coefficients, and between the tidal parameters for binary systems are essential to break degeneracies in gravitational wave data analysis. Here, we validate and recalibrate these universal relations using a large set of almost 2 million phenomenological EOSs that are consistent with current observations. In doing so, we extend universal relations to a larger region of the EOS parameter space, most notably to softer EOSs and larger compactnesses. We show that waveform models that neglect higher-than-leading-order tidal deformations of the NSs accumulate as much as 3.5 radians of dephasing from 20 Hz to merger. We also perform a full Bayesian parameter estimation of the GW170817 data, and we compare the NS radius constraints produced using universal relations from the literature and the updated fits we propose here. We find that the new fits yield a NS radius that is smaller by about 500 meters. This difference is less than the statistical uncertainty on the radius at the signal-to-noise ratio of GW170817, but it is significantly larger than the precision anticipated for next-generation detectors.
AB - Equation of state (EOS) insensitive relations, so-called universal relations, between the neutron star (NS) compactness, its multipolar tidal deformability coefficients, and between the tidal parameters for binary systems are essential to break degeneracies in gravitational wave data analysis. Here, we validate and recalibrate these universal relations using a large set of almost 2 million phenomenological EOSs that are consistent with current observations. In doing so, we extend universal relations to a larger region of the EOS parameter space, most notably to softer EOSs and larger compactnesses. We show that waveform models that neglect higher-than-leading-order tidal deformations of the NSs accumulate as much as 3.5 radians of dephasing from 20 Hz to merger. We also perform a full Bayesian parameter estimation of the GW170817 data, and we compare the NS radius constraints produced using universal relations from the literature and the updated fits we propose here. We find that the new fits yield a NS radius that is smaller by about 500 meters. This difference is less than the statistical uncertainty on the radius at the signal-to-noise ratio of GW170817, but it is significantly larger than the precision anticipated for next-generation detectors.
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U2 - 10.1103/PhysRevD.103.063036
DO - 10.1103/PhysRevD.103.063036
M3 - Article
AN - SCOPUS:85104234157
VL - 103
JO - Physical Review D
JF - Physical Review D
SN - 2470-0010
IS - 6
M1 - 063036
ER -