Identifying QCD Phase Transitions via the Gravitational Wave Frequency from a Supernova Explosion

We investigate the nonradial oscillations of newly born neutron stars (NSs) and strange quark stars (SQSs). This is done with the relativistic nuclear field theory with hyperon degrees of freedom employed to describe the equation of state (EoS) for the stellar matter in NSs, and with both the MIT ba...

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Bibliographic Details
Published in:The Astrophysical journal 2021-12, Vol.922 (2), p.266
Main Authors: Bai, Zhan, Fu, Wei-jie, Liu, Yu-xin
Format: Article
Language:English
Subjects:
Astrophysics
Compact objects
Equations of state
Field theory
Gravitational waves
Neutron stars
Oscillations
Phase transitions
Quantum chromodynamics
Quark stars
Quarks
Relativistic theory
Resonant frequencies
Stellar oscillations
Stiffness
Supernova
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Summary:We investigate the nonradial oscillations of newly born neutron stars (NSs) and strange quark stars (SQSs). This is done with the relativistic nuclear field theory with hyperon degrees of freedom employed to describe the equation of state (EoS) for the stellar matter in NSs, and with both the MIT bag model and the Nambu–Jona-Lasinio model adopted to construct the configurations of the SQSs. We find that the gravitational-mode ( g -mode) eigenfrequencies of newly born SQSs are significantly lower than those of NSs, which is independent of models implemented to describe the EoS for the strange quark matter. Meanwhile, the eigenfrequencies of the other modes of nonradial oscillations, e.g., fundamental ( f )- and pressure ( p )-modes, are much larger than those of the g -mode, and are related to the stiffness of the EoSs. In light of the first direct observation of gravitational waves (GWs), it is promising to employ GWs to identify the QCD phase transition in high-density strong-interaction matter.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ac2a31