Relativistic hybrid stars in light of the NICER PSR J0740 + 6620 radius measurement
Abstract
We explore the implications of the recent radius determination of PSR J0740 + 6620 by the NICER experiment, combined with the neutron skin measurement by the PREX-II experiment and the associated inference of the slope of symmetry energy, for the structure of hybrid stars with a strong first-order phase transition from nucleonic to quark matter. Furthermore, we combine a covariant density-functional nucleonic equation of state (EOS) with a constant-speed-of-sound EOS for quark matter. We show that the radius and tidal deformability ranges obtained from GW170817 can be reconciled with the implication of the PREX-II experiment if there is a phase transition to quark matter in the low-mass compact star. In the high-mass segment, the EOS needs to be stiff to comply with the large-radius inference for PSR J0740 + 6620 and J0030 + 0451 with masses M ≃ 2 M⊙ and M≃1.4 M⊙. We show that twin stars are not excluded, but the mass and radius ranges (with M ≥ M⊙) are restricted to narrow domains ΔMtwin ≲ 0.05 M⊙ and ΔRtwin ~ 1.0 km. We also show that the existence of twin configurations is compatible with the light companion in the GW190814 event being a hybrid star in themore »
- Authors:
-
[1];
[2];
[3]
- Southwest Univ., Chongqing (China)
- Univ. of Wroclaw (Poland)
- Washington Univ., St. Louis, MO (United States)
- Publication Date:
- Research Org.:
- Washington Univ., St. Louis, MO (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- OSTI Identifier:
- 1837694
- Grant/Contract Number:
- FG02-05ER41375
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review D
- Additional Journal Information:
- Journal Volume: 104; Journal Issue: 12; Journal ID: ISSN 2470-0010
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Nuclear matter in neutron stars; Neutron stars & pulsars
Citation Formats
Li, Jia Jie, Sedrakian, Armen, and Alford, Mark. Relativistic hybrid stars in light of the NICER PSR J0740 + 6620 radius measurement. United States: N. p., 2021.
Web. doi:10.1103/physrevd.104.l121302.
Li, Jia Jie, Sedrakian, Armen, & Alford, Mark. Relativistic hybrid stars in light of the NICER PSR J0740 + 6620 radius measurement. United States. https://doi.org/10.1103/physrevd.104.l121302
Li, Jia Jie, Sedrakian, Armen, and Alford, Mark. Tue .
"Relativistic hybrid stars in light of the NICER PSR J0740 + 6620 radius measurement". United States. https://doi.org/10.1103/physrevd.104.l121302. https://www.osti.gov/servlets/purl/1837694.
@article{osti_1837694,
title = {Relativistic hybrid stars in light of the NICER PSR J0740 + 6620 radius measurement},
author = {Li, Jia Jie and Sedrakian, Armen and Alford, Mark},
abstractNote = {We explore the implications of the recent radius determination of PSR J0740 + 6620 by the NICER experiment, combined with the neutron skin measurement by the PREX-II experiment and the associated inference of the slope of symmetry energy, for the structure of hybrid stars with a strong first-order phase transition from nucleonic to quark matter. Furthermore, we combine a covariant density-functional nucleonic equation of state (EOS) with a constant-speed-of-sound EOS for quark matter. We show that the radius and tidal deformability ranges obtained from GW170817 can be reconciled with the implication of the PREX-II experiment if there is a phase transition to quark matter in the low-mass compact star. In the high-mass segment, the EOS needs to be stiff to comply with the large-radius inference for PSR J0740 + 6620 and J0030 + 0451 with masses M ≃ 2 M⊙ and M≃1.4 M⊙. We show that twin stars are not excluded, but the mass and radius ranges (with M ≥ M⊙) are restricted to narrow domains ΔMtwin ≲ 0.05 M⊙ and ΔRtwin ~ 1.0 km. We also show that the existence of twin configurations is compatible with the light companion in the GW190814 event being a hybrid star in the case of values of the sound-speed square s = 0.6 and s = 1/3.},
doi = {10.1103/physrevd.104.l121302},
journal = {Physical Review D},
number = 12,
volume = 104,
place = {United States},
year = {Tue Dec 21 00:00:00 EST 2021},
month = {Tue Dec 21 00:00:00 EST 2021}
}
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