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  Equation-of-state constraints and the QCD phase transition in the era of gravitational-wave astronomy

Bauswein, A., Bastian, N.-U.-F., Blaschke, D., Chatziioannou, K., Clark, J. A., Fischer, T., et al. (2019). Equation-of-state constraints and the QCD phase transition in the era of gravitational-wave astronomy. In L. Ang, L. Bao-An, & X. Furong (Eds.), Xiamen-CUSTIPEN Workshop on the EOS of Dense Neutron-Rich Matter in the Era of Gravitational Wave Astronomy. doi:10.1063/1.5117803.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-C393-8 Version Permalink: https://hdl.handle.net/21.11116/0000-0005-C394-7
Genre: Conference Paper

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 Creators:
Bauswein, Andreas, Author
Bastian, Niels-Uwe Friedrich, Author
Blaschke, David, Author
Chatziioannou, Katerina, Author
Clark, James Alexander, Author
Fischer, Tobias, Author
Janka, Hans-Thomas1, Author           
Just, Oliver, Author
Oertel, Micaela, Author
Stergioulas, Nikolaos, Author
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1Stellar Astrophysics, MPI for Astrophysics, Max Planck Society, ou_159882              

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 Abstract: 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.

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Language(s): eng - English
 Dates: 2019-07-17
 Publication Status: Published online
 Pages: -
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 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1063/1.5117803
Other: LOCALID: 3196771
 Degree: -

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Title: Xiamen-CUSTIPEN Workshop on the EOS of Dense Neutron-Rich Matter in the Era of Gravitational Wave Astronomy
Place of Event: Xiamen, China
Start-/End Date: 2019-01-03 - 2019-01-07

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Title: Xiamen-CUSTIPEN Workshop on the EOS of Dense Neutron-Rich Matter in the Era of Gravitational Wave Astronomy
Source Genre: Proceedings
 Creator(s):
Ang , Li, Editor
Bao-An, Li, Editor
Furong, Xu, Editor
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Publ. Info: -
Pages: - Volume / Issue: 2127 Sequence Number: 090003 Start / End Page: - Identifier: ISBN: 978-0-7354-1841-7

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Title: AIP Conference Proceedings
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Publ. Info: AIP Publishing
Pages: - Volume / Issue: 2109 Sequence Number: 020013 Start / End Page: - Identifier: ISSN: 978-0-7354-1869-1