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Title: Combined Constraints on the Equation of State of Dense Neutron-rich Matter from Terrestrial Nuclear Experiments and Observations of Neutron Stars

Abstract

Within the parameter space of the equation of state (EOS) of dense neutron-rich matter limited by existing constraints mainly from terrestrial nuclear experiments, we investigate how the neutron star maximum mass Mmax > 2.01 ± 0.04 M⊙, radius 10.62 km < R1.4 < 12.83 km and tidal deformability Λ1.4 ≤ 800 of canonical neutron stars together constrain the EOS of dense neutron-rich nucleonic matter. While the 3D parameter space of Ksym (curvature of nuclear symmetry energy), Jsym, and J0 (skewness of the symmetry energy and EOS of symmetric nuclear matter, respectively) is narrowed down significantly by the observational constraints, more data are needed to pin down the individual values of Ksym, Jsym, and J0. The J0 largely controls the maximum mass of neutron stars. While the EOS with J0 = 0 is sufficiently stiff to support neutron stars as massive as 2.37 M⊙, supporting the hypothetical ones as massive as 2.74 M⊙ (composite mass of GW170817) requires J0 to be larger than its currently known maximum value of about 400 MeV and beyond the causality limit. The upper limit on the tidal deformability of Λ1.4 = 800 from the recent observation of GW170817 is found to provide upper limits onmore » some EOS parameters consistent with but far less restrictive than the existing constraints of other observables studied.« less

Authors:
 [1];  [2];  [3]
  1. Texas A & M Univ., Commerce, TX (United States). Dept. of Physics and Astronomy; Shandong Univ., Weihai (China). Inst. of Space Sciences
  2. Texas A & M Univ., Commerce, TX (United States). Dept. of Physics and Astronomy
  3. Chinese Academy of Sciences (CAS), Shanghai (China). Shanghai Inst. of Applied Physics
Publication Date:
Research Org.:
Texas A & M Univ., Commerce, TX (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP)
OSTI Identifier:
1542024
Alternate Identifier(s):
OSTI ID: 1658225
Grant/Contract Number:  
SC0009971; SC0013702
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 859; Journal Issue: 2; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; dense matter; equation of state; stars: neutron

Citation Formats

Zhang, Nai-Bo, Li, Bao-An, and Xu, Jun. Combined Constraints on the Equation of State of Dense Neutron-rich Matter from Terrestrial Nuclear Experiments and Observations of Neutron Stars. United States: N. p., 2018. Web. doi:10.3847/1538-4357/aac027.
Zhang, Nai-Bo, Li, Bao-An, & Xu, Jun. Combined Constraints on the Equation of State of Dense Neutron-rich Matter from Terrestrial Nuclear Experiments and Observations of Neutron Stars. United States. doi:10.3847/1538-4357/aac027.
Zhang, Nai-Bo, Li, Bao-An, and Xu, Jun. Tue . "Combined Constraints on the Equation of State of Dense Neutron-rich Matter from Terrestrial Nuclear Experiments and Observations of Neutron Stars". United States. doi:10.3847/1538-4357/aac027. https://www.osti.gov/servlets/purl/1542024.
@article{osti_1542024,
title = {Combined Constraints on the Equation of State of Dense Neutron-rich Matter from Terrestrial Nuclear Experiments and Observations of Neutron Stars},
author = {Zhang, Nai-Bo and Li, Bao-An and Xu, Jun},
abstractNote = {Within the parameter space of the equation of state (EOS) of dense neutron-rich matter limited by existing constraints mainly from terrestrial nuclear experiments, we investigate how the neutron star maximum mass Mmax > 2.01 ± 0.04 M⊙, radius 10.62 km < R1.4 < 12.83 km and tidal deformability Λ1.4 ≤ 800 of canonical neutron stars together constrain the EOS of dense neutron-rich nucleonic matter. While the 3D parameter space of Ksym (curvature of nuclear symmetry energy), Jsym, and J0 (skewness of the symmetry energy and EOS of symmetric nuclear matter, respectively) is narrowed down significantly by the observational constraints, more data are needed to pin down the individual values of Ksym, Jsym, and J0. The J0 largely controls the maximum mass of neutron stars. While the EOS with J0 = 0 is sufficiently stiff to support neutron stars as massive as 2.37 M⊙, supporting the hypothetical ones as massive as 2.74 M⊙ (composite mass of GW170817) requires J0 to be larger than its currently known maximum value of about 400 MeV and beyond the causality limit. The upper limit on the tidal deformability of Λ1.4 = 800 from the recent observation of GW170817 is found to provide upper limits on some EOS parameters consistent with but far less restrictive than the existing constraints of other observables studied.},
doi = {10.3847/1538-4357/aac027},
journal = {The Astrophysical Journal (Online)},
number = 2,
volume = 859,
place = {United States},
year = {2018},
month = {5}
}

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