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arxiv: 1809.01116 · v2 · pith:RVRMIVPWnew · submitted 2018-09-04 · 🌌 astro-ph.HE · hep-ph· nucl-th

Identifying a first-order phase transition in neutron star mergers through gravitational waves

Andreas Bauswein , Niels-Uwe F. Bastian , David B. Blaschke , Katerina Chatziioannou , James A. Clark , Tobias Fischer , Micaela Oertel This is my paper
classification 🌌 astro-ph.HE hep-phnucl-th
keywords first-orderphasetransitionneutronpostmergerstrongdominantfrequency
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We identify an observable imprint of a first-order hadron-quark phase transition at supranuclear densities on the gravitational-wave (GW) emission of neutron star mergers. Specifically, we show that the dominant postmerger GW frequency f_peak may exhibit a significant deviation from an empirical relation between f_peak and the tidal deformability if a strong first-order phase transition leads to the formation of a gravitationally stable extended quark matter core in the postmerger remnant. A comparison of the GW signatures from a large, representative sample of microphysical, purely hadronic equations of state indicates that this imprint is only observed in those systems which undergo a strong first-order phase transition. Such a shift of the dominant postmerger GW frequency can be revealed by future GW observations, which would provide evidence for the existence of a strong first-order phase transition in the interior of neutron stars.

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