Strangeon Ergostars
Haojia Xia, Shichuan Chen, Hong-Bo Li, Enping Zhou, Ren-Xin Xu

TL;DR
This study explores the viability of ergostars as central engines for short gamma-ray bursts using a strangeon matter equation of state, revealing a large stable parameter space and sufficient energy for powering sGRBs.
Contribution
It demonstrates that strangeon matter allows for stable ergostars without extreme conditions, unlike conventional neutron star models, revitalizing the ergostar hypothesis for sGRBs.
Findings
Stable ergostars exist with strangeon matter EOS.
Extractable energy can reach about 0.01 solar masses.
Supports ergostars as viable sGRB central engines.
Abstract
The nature of the central engine powering short gamma-ray bursts (sGRBs) in binary neutron star (BNS) mergers remains a key open question in the era of multi-messenger astronomy. The ergostar hypothesis, that a rapidly rotating star with an ergoregion drives the relativistic jet, offers an alternative explanation to the black hole-accretion disk paradigm. However, previous studies based on conventional neutron star equations of state (EOSs) have shown that dynamically stable ergostars do not exist unless very extreme EOS or rotation are adopted, casting significant doubt on their astrophysical viability in reality. In this work, however, we examine this hypothesis using a phenomenological EOS of strangeon matter, i.e., condensed matter with nucleon-like units for three flavors of quarks. By constructing a large suite of uniformly rotating equilibrium models, we systematically…
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Taxonomy
TopicsGamma-ray bursts and supernovae · Pulsars and Gravitational Waves Research · Earth Systems and Cosmic Evolution
