Equation-of-state Constraints and the QCD Phase Transition in the Era of Gravitational-Wave Astronomy

被引：55

作者：

Bauswein, Andreas ^{[1
]}

Bastian, Niels-Uwe Friedrich ^{[2
]}

Blaschke, David ^{[2
,3
]}

Chatziioannou, Katerina ^{[4
]}

Clark, James Alexander ^{[5
]}

Fischer, Tobias ^{[2
]}

Janka, Hans-Thomas ^{[6
]}

Just, Oliver ^{[7
]}

Oertel, Micaela ^{[8
]}

Stergioulas, Nikolaos ^{[9
]}

机构：

[1] GSI Helmholtzzentrum Schwerionenforsch, Planckstr 1, D-64291 Darmstadt, Germany

[2] Univ Wroclaw, Inst Theoret Phys, Max Born Pl 9, PL-50204 Wroclaw, Poland

[3] JINR Dubna, Bogoliubov Lab Theoret Phys, Joliot Curie Str 6, Dubna 141980, Russia

[4] Flatiron Inst, Ctr Computat Astrophys, 162 5th Ave, New York, NY 10010 USA

[5] Georgia Inst Technol, Sch Phys, Ctr Relativist Astrophys, Atlanta, GA 30332 USA

[6] Max Planck Inst Astrophys, Karl Schwarzschild Str 1, D-85748 Garching, Germany

[7] RIKEN, Cluster Pioneering Res, Astrophys Big Bang Lab, 2-1 Hirosawa, Wako, Saitama 3510198, Japan

[8] Univ Paris Diderot, Sorbonne Paris Cite, PSL Res Univ, LUTH,CNRS,Observ Paris, 5 Pl Jules Janssen, F-92195 Meudon, France

[9] Aristotle Univ Thessaloniki, Dept Phys, Thessaloniki 54124, Greece

来源：

XIAMEN-CUSTIPEN WORKSHOP ON THE EQUATION OF STATE OF DENSE NEUTRON-RICH MATTER IN THE ERA OF GRAVITATIONAL WAVE ASTRONOMY | 2019年 / 2127卷

基金：

俄罗斯科学基金会; 欧洲研究理事会;

关键词：

NEUTRON-STARS; COMPACT STARS; PARAMETERS;

D O I：

10.1063/1.5117803

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We describe a multi-messenger interpretation of GW170817, which yields a robust lower limit on NS radii. This excludes NSs with radii smaller than about 10.7 km and thus rules out very soft nuclear matter. We stress the potential of this type of constraints when future detections become available. For instance, a very similar argumentation may yield an upper bound on the maximum mass of nonrotating NSs. We also discuss simulations of NS mergers, which undergo a first-order phase transition to quark matter. We point out a different dynamical behavior. Considering the gravitational-wave signal, we identify an unambiguous signature of the QCD phase transition in NS mergers. We show that the occurrence of quark matter through a strong first-order phase transition during merging leads to a characteristic shift of the dominant postmerger frequency. The frequency shift is indicative for a phase transition if it is compared to the postmerger frequency which is expected for purely hadronic EoS models. A very strong deviation of several 100 Hz is observed for hybrid EoSs in an otherwise tight relation between the tidal deformability and the postmerger frequency. In future events the tidal deformability will be inferred with sufficient precision from the premerger phase, while the dominant postmerger frequency can be obtained when current detectors reach a higher sensitivity in the high-frequency range within the next years. Finally, we address the potential impact of a first-order phase transition on the electromagnetic counterpart of NS mergers. Our simulations suggest that there would be no significant qualitative differences between a system undergoing a phase transition to quark matter and purely hadronic mergers. The quantitative differences are within the spread which is found between different hadronic EoS models. This implies on the one hand that GW170817 is compatible with a possible transition to quark matter. On the other hand these considerations show that it may not be easy to identify quantitative differences between purely hadronic mergers and events in which quark matter occurs considering solely their electromagnetic counterpart or their nucleosynthesis products.

引用

页数：15

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