Hyperonic degrees of freedom in binary neutron star mergers
Abstract
We analyze the influence of hyperons in binary neutron star mergers considering several different equations of state that include hyperons. By running a large set of simulations, we study the impact of the thermally produced hyperons on the gravitational-wave spectral features, the temperature evolution of the remnant, the mass ejecta and the threshold mass for prompt collapse to a black hole. Models with hyperons tend to stand out in the relation between the dominant postmerger gravitational-wave frequency and the tidal deformability of massive stars. Moreover, the averaged temperature of the remnant is reduced for hyperonic models. The mass ejection of the mergers is tentatively enhanced when hyperons are present in comparison to nucleonic EoSs leading to similar stellar properties of cold neutron stars, whereas the threshold mass for prompt black-hole formation is reduced by about 0.05~ compared to the nucleonic models.
Cite
@article{arxiv.2507.18213,
title = {Hyperonic degrees of freedom in binary neutron star mergers},
author = {Laura Tolos and Hristijan Kochankovski and Angels Ramos and Georgios Lioutas and Sebastian Blacker and Andreas Bauswein},
journal= {arXiv preprint arXiv:2507.18213},
year = {2025}
}
Comments
8 pages, 4 figures, contribution based on the keynote parallel talk at the 21st International Conference on Hadron Spectroscopy and Structure (HADRON2025), 27 - 31 March, 2025, Osaka University, Japan