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Open AccessArticle

Parity Doubling and the Dense-Matter Phase Diagram under Constraints from Multi-Messenger Astronomy

1
Institute of Theoretical Physics, University of Wrocław, PL-50204 Wrocław, Poland
2
Bogoliubov Laboratory of Theoretical Physics, Joint Institute for Nuclear Research, 141980 Dubna, Russia
3
National Research Nuclear University (MEPhI), 115409 Moscow, Russia
4
Extreme Matter Institute EMMI, GSI, D-64291 Darmstadt, Germany
*
Author to whom correspondence should be addressed.
Universe 2019, 5(8), 180; https://doi.org/10.3390/universe5080180
Received: 14 May 2019 / Revised: 24 July 2019 / Accepted: 26 July 2019 / Published: 30 July 2019
We extend the recently developed hybrid quark–meson–nucleon model by augmenting a six-point scalar interaction and investigate the consequences for neutron-star sequences in the mass–radius diagram. One of the characteristic features of the model is that the chiral symmetry is restored within the hadronic phase by lifting the mass splitting between chiral partner states, before quark deconfinement takes place. At low temperature and finite baryon density, the model predicts a first- or second-order chiral phase transition, or a crossover, depending on the expectation value of a scalar field, and a first-order deconfinement phase transition. We discuss two sets of free parameters, which result in compact-star mass–radius relations that are at tension with the combined constraints for maximum-mass ( 2 M ) and the compactness (GW170817). We find that the most preferable mass–radius relations result in isospin-symmetric phase diagram with rather low temperature for the critical point of the chiral phase transition. View Full-Text
Keywords: parity doubling; chiral phase transition; neutron stars; mass–radius relation; phase diagram parity doubling; chiral phase transition; neutron stars; mass–radius relation; phase diagram
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Marczenko, M.; Blaschke, D.; Redlich, K.; Sasaki, C. Parity Doubling and the Dense-Matter Phase Diagram under Constraints from Multi-Messenger Astronomy. Universe 2019, 5, 180.

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