Hyperon Matter and Black Hole Formation in Failed Supernovae

TL;DR

This study explores how hyperons and pions influence black hole formation in failed supernovae through detailed simulations, revealing that hyperons shorten neutrino emission duration and pions also promote collapse.

Contribution

It provides the first detailed simulation-based analysis of hyperon and pion effects on black hole formation in failed supernovae using realistic hyperonic EOS.

Findings

Hyperons shorten the neutrino emission duration before black hole formation.

Attractive b5b5 hyperons appear more easily, affecting the collapse process.

Pions also promote the recollapse towards black hole formation.

Abstract

We investigate the emergence of hyperons in black-hole-forming failed supernovae, which are caused by the dynamical collapse of nonrotating massive stars. We perform neutrino-radiation hydrodynamical simulations in general relativity adopting realistic hyperonic equation-of-state (EOS). Attractive and repulsive cases are examined for the potential of \Sigma\ hyperons. Since hyperons soften the EOS, they shorten the time interval from the bounce to black hole formation, which corresponds to the duration of neutrino emission. This effect is larger for the attractive case than the repulsive case because \Sigma\ hyperons appear more easily. In addition, we investigate the impacts of pions to find that they also promotes the recollapse towards the black hole formation.