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Universe 2018, 4(3), 50; https://doi.org/10.3390/universe4030050

The Merger of Two Compact Stars: A Tool for Dense Matter Nuclear Physics

1
Dipartimento di Fisica e Scienze della Terra dell’Università di Ferrara and INFN Sez. di Ferrara, I-44100 Ferrara, Italy
2
Sternberg Astronomical Institute, Lomonosov Moscow State University, 119234 Moscow, Russia
3
National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China
4
School of Astronomy & Space Science, University of the Chinese Academy of Sciences, Beijing 100012, China
*
Author to whom correspondence should be addressed.
Received: 1 February 2018 / Revised: 19 February 2018 / Accepted: 20 February 2018 / Published: 7 March 2018
(This article belongs to the Special Issue Compact Stars in the QCD Phase Diagram)
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Abstract

We discuss the different signals, in gravitational and electromagnetic waves, emitted during the merger of two compact stars. We will focus in particular on the possible contraints that those signals can provide on the equation of state of dense matter. Indeed, the stiffness of the equation of state and the particle composition of the merging compact stars strongly affect, e.g., the life time of the post-merger remnant and its gravitational wave signal, the emission of the short gamma-ray-burst, the amount of ejected mass and the related kilonova. The first detection of gravitational waves from the merger of two compact stars in August 2017, GW170817, and the subsequent detections of its electromagnetic counterparts, GRB170817A and AT2017gfo, is the first example of the era of “multi-messenger astronomy”: we discuss what we have learned from this detection on the equation of state of compact stars and we provide a tentative interpretation of this event, within the two families scenario, as being due to the merger of a hadronic star with a quark star. View Full-Text
Keywords: Gravitational waves; Gamma-ray bursts; nuclear matter; neutron stars Gravitational waves; Gamma-ray bursts; nuclear matter; neutron stars
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Drago, A.; Pagliara, G.; Popov, S.B.; Traversi, S.; Wiktorowicz, G. The Merger of Two Compact Stars: A Tool for Dense Matter Nuclear Physics. Universe 2018, 4, 50.

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