Probing the equation of state of the early Universe with pulsar timing arrays [PDF]
Journal of Cosmology and Astroparticle Physics, 2023 The recently released data by pulsar timing array (PTA) collaborations have amassed substantial evidence corroborating the existence of a stochastic signal consistent with a gravitational-wave background at frequencies around the nanohertz regime.
Lang Liu, Zu-Cheng Chen, Q. Huang
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The state of the dark energy equation of state circa 2023 [PDF]
Journal of Cosmology and Astroparticle Physics, 2023 We critically examine the state of current constraints on the dark energy (DE) equation of state (EoS) w. Our study is motivated by the observation that, while broadly consistent with the cosmological constant value w = -1, several independent probes ...
Luis A. Escamilla +4 more
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Simultaneously probing the sound speed and equation of state of the early Universe with pulsar timing arrays [PDF]
Journal of Cosmology and Astroparticle Physics, 2023 Recently, several major pulsar timing array (PTA) collaborations have assembled strong evidence for the existence of a gravitational-wave background at frequencies around the nanohertz regime.
Lang Liu, You Wu, Zu-Cheng Chen
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Bayesian uncertainty quantification of perturbative QCD input to the neutron-star equation of state [PDF]
Journal of High Energy Physics, 2023 The equation of state of neutron-star cores can be constrained by requiring a consistent connection to the perturbative Quantum Chromodynamics (QCD) calculations at high densities.
Tyler Gorda +3 more
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Neural network reconstruction of the dense matter equation of state from neutron star observables [PDF]
Journal of Cosmology and Astroparticle Physics, 2022 The Equation of State (EoS) of strongly interacting cold and hot ultra-dense QCD matter remains a major challenge in the field of nuclear astrophysics. With the advancements in measurements of neutron star masses, radii, and tidal deformabilities, from ...
Shriya Soma +4 more
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Equation of state and speed of sound of isospin-asymmetric QCD on the lattice [PDF]
Journal of High Energy Physics, 2022 We determine the QCD equation of state at nonzero temperature in the presence of an isospin asymmetry between the light quark chemical potentials on the lattice.
B. Brandt, F. Cuteri, G. Endrődi
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Equation of state for hot hyperonic neutron star matter [PDF]
Monthly notices of the Royal Astronomical Society, 2022 The FSU2H equation of state model, originally developed to describe cold neutron star matter with hyperonic cores, is extended to finite temperature.
Hristijan Kochankovski +2 more
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Equation of state of hard-disk fluids under single-file confinement. [PDF]
Journal of Chemical Physics, 2022 The exact transfer-matrix solution for the longitudinal equilibrium properties of the single-file hard-disk fluid is used to study the limiting low- and high-pressure behaviors analytically as functions of the pore width.
Ana M. Montero, Andrés Santos
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GW170817: Measurements of Neutron Star Radii and Equation of State. [PDF]
Physical Review Letters, 2018 On 17 August 2017, the LIGO and Virgo observatories made the first direct detection of gravitational waves from the coalescence of a neutron star binary system.
B. Abbott +499 more
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Tight multimessenger constraints on the neutron star equation of state from GW170817 and a forward model for kilonova light-curve synthesis [PDF]
Monthly notices of the Royal Astronomical Society, 2021 We present a rapid analytic framework for predicting kilonova light curves following neutron star (NS) mergers, where the main input parameters are binary-based properties measurable by gravitational wave detectors (chirp mass and mass ratio, orbital ...
M. Nicholl +5 more
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