https://doi.org/10.1140/epjst/e2020-000093-3
Regular Article
Speed of sound and quark confinement inside neutron stars
Institute of Theoretical Physics, University of Wrocław,
plac Maksa Borna 9,
50-204
Wrocław, Poland
a e-mail: michal.marczenko@uwr.edu.pl
Received:
23
May
2020
Accepted:
27
October
2020
Published online: 21 December 2020
Several observations of high-mass neutron stars (NSs), as well as the first historic detection of the binary neutron star merger GW170817, have delivered stringent constraints on the equation of state (EoS) of cold and dense matter. Recent studies suggest that, in order to simultaneously accommodate a 2M⊙ NS and the upper limit on the compactness, the pressure has to swiftly increase with density and the corresponding speed of sound likely exceeds the conformal limit. In this work, we employ a unified description of hadron-quark matter, the hybrid quark-meson-nucleon (QMN) model, to investigate the EoS under NS conditions. We show that the dynamical confining mechanism of the model plays an important role in explaining the observed properties of NSs.
© The Author(s) 2020
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
