Speaker
Description
We study the influence of hyperons in binary neutron star (NS) mergers, considering equations of state (EoSs) models which include hyperonic degrees of freedom and partly delta resonances. Thermally produced hyperons induce a higher heat capacity and a lower thermal index, i.e. a reduced thermal pressure for a given amount of thermal energy, compared to purely nucleonic models. These EoSs are inserted in simulations of NS mergers to explore the impact on observables of these events. We find a characteristic increase of the dominant postmerger gravitational-wave (GW) frequency by a few per cent, which is specifically linked to the occurrence of hyperons and can thus be potentially used as a discriminator between purely nucleonic and hyperonic systems. Also, the threshold mass for prompt black hole formation is reduced by about 0.05M⊙ for hyperonic EoSs in comparison to nucleonic ones with the same stellar parameters of cold NSs.
