A scalable random forest regressor for combining neutron-star equation of state measurements: A case study with GW170817 and GW190425

Abstract

Gravitational-wave observations of binary neutron star coalescences constrain the neutron-star equation of state by enabling measurement of the tidal deformation of each neutron star. This deformation is determined by the tidal deformability parameter $\Lambda$, which was constrained using the first binary neutron star gravitational-wave observation, GW170817. Now, with the measurement of the second binary neutron star, GW190425, we can combine different gravitational-wave measurements to obtain tighter constraints on the neutron-star equation of state. In this paper, we combine data from GW170817 and GW190425 to place constraints on the neutron-star equation of state. To facilitate this calculation, we derive interpolated marginalized likelihoods for each event using a machine learning algorithm. These likelihoods, which we make publicly available, allow for results from multiple gravitational-wave signals to be easily combined. Using these new data products, we find that the radius of a fiducial 1.4 $M_{\odot }$ neutron star is constrained to $11.6_{-0.9}^{+1.6}$ km at 90% confidence and the pressure at twice the nuclear saturation density is constrained to $3.1_{-1.3}^{+3.1}\times 10^{34}$ dyne/cm${}^2$ at 90% confidence. This result is dominated by GW170817 and is consistent with findings from other works.

6 pages, 3 figures. Accepted for publication in MNRAS

References in corpus (15)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• Advanced Virgo: a 2nd generation interferometric gravitational wave detector
• A Massive Pulsar in a Compact Relativistic Binary
• Advanced LIGO
• GW190814: Gravitational Waves from the Coalescence of a 23 M${}_{\odot }$ Black Hole with a 2.6 M${}_{\odot }$ Compact Object
• PSR J0030+0451 Mass and Radius from NICER Data and Implications for the Properties of Neutron Star Matter
• A NICER View of PSR J0030+0451: Millisecond Pulsar Parameter Estimation
• Tidal Love numbers of neutron stars
• Constraints on a phenomenologically parameterized neutron-star equation of state
• A NICER view of PSR J0030+0451: Implications for the dense matter equation of state
• Reconstructing the neutron-star equation of state with gravitational-wave detectors from a realistic population of inspiralling binary neutron stars
• GW190814: Impact of a 2.6 solar mass neutron star on nucleonic equations of state
• The landscape of disk outflows from black hole - neutron star mergers
• Inferring the population properties of binary black holes from unresolved gravitational waves
• Inferring the neutron star equation of state simultaneously with the population of merging neutron stars

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