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Communication Dans Un Congrès Année : 2019

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

Andreas Bauswein
  • Fonction : Auteur
Niels-Uwe Friedrich Bastian
  • Fonction : Auteur
David Blaschke
  • Fonction : Auteur
Katerina Chatziioannou
  • Fonction : Auteur
James Alexander Clark
  • Fonction : Auteur
Tobias Fischer
  • Fonction : Auteur
Hans-Thomas Janka
  • Fonction : Auteur
Oliver Just
  • Fonction : Auteur
Micaela Oertel
Nikolaos Stergioulas
  • Fonction : Auteur

Résumé

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 counter-part 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.

Dates et versions

hal-02116547 , version 1 (01-05-2019)

Identifiants

Citer

Andreas Bauswein, Niels-Uwe Friedrich Bastian, David Blaschke, Katerina Chatziioannou, James Alexander Clark, et al.. Equation-of-state Constraints and the QCD Phase Transition in the Era of Gravitational-Wave Astronomy. Xiamen-CUSTIPEN Workshop on the EOS of Dense Neutron-Rich Matter in the Era of Gravitational Wave Astronomy, Jan 2019, Xiamen, China. pp.020013, ⟨10.1063/1.5117803⟩. ⟨hal-02116547⟩
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