Bayesian Exploration of Phenomenological EoS of Neutron/Hybrid Stars with Recent Observations
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Published:2023-02-02
Issue:1
Volume:6
Page:198-216
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ISSN:2571-712X
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Container-title:Particles
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language:en
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Short-container-title:Particles
Author:
Chimanski Emanuel V.1ORCID, Lobato Ronaldo V.23ORCID, Goncalves Andre R.4ORCID, Bertulani Carlos A.2ORCID
Affiliation:
1. National Nuclear Data Center, Brookhaven National Laboratory, Upton, NY 11973, USA 2. Department of Physics and Astronomy, Texas A&M University, Commerce, TX 75428, USA 3. Departamento de Física, Universidad de los Andes, Cra 1E, 18A-10, Bogotá 111711, Colombia 4. Computer Engineering Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94720, USA
Abstract
The description of the stellar interior of compact stars remains as a big challenge for the nuclear astrophysics community. The consolidated knowledge is restricted to density regions around the saturation of hadronic matter ρ0=2.8×1014gcm−3, regimes where our nuclear models are successfully applied. As one moves towards higher densities and extreme conditions up to the quark/gluons deconfinement, little can be said about the microphysics of the equation of state (EoS). Here, we employ a Markov Chain Monte Carlo (MCMC) strategy to access the variability at high density regions of polytropic piecewise models for neutron star (NS) EoS or possible hybrid stars, i.e., a NS with a small quark-matter core. With a fixed description of the hadronic matter for low density, below the nuclear saturation density, we explore a variety of models for the high density regimes leading to stellar masses near to 2.5M⊙, in accordance with the observations of massive pulsars. The models are constrained, including the observation of the merger of neutrons stars from VIRGO-LIGO and with the pulsar observed by NICER. In addition, we also discuss the possibility of the use of a Bayesian power regression model with heteroscedastic error. The set of EoS from the Laser Interferometer Gravitational-Wave Observatory (LIGO) was used as input and treated as the data set for the testing case.
Funder
U.S. Department of Energy Texas A&M System National Laboratory Office and Los Alamos National Laboratory UNIANDES University Office of Nuclear Physics, Office of Science of the U.S. Department of Energy
Subject
Physics and Astronomy (miscellaneous),Astronomy and Astrophysics,Nuclear and High Energy Physics
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