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arXiv · 2611.04679

Quark deconfinement as a natural trigger of Type-I critical collapse: black holes from neutron stars deemed stable

Hrishikesh Borthakur·Ritam Mallick
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Abstract

Spherically symmetric general-relativistic simulations show that a first-order hadron--quark phase transition can collapse radially stable neutron stars into black holes, even when a stable hybrid star of the same baryon mass exists. The dynamical threshold lies $0.12\,M_\odot$ in baryon mass below the static one, so black holes can be lighter than the heaviest stable star. The threshold is a Type-I critical point: near it, the star lingers at an unstable hybrid star of equal baryon mass for a time set by that star's unstable mode. The effect persists within a narrower window for finite conversion rates.

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Hrishikesh Borthakur, Ritam Mallick. 2026-11-03. Quark deconfinement as a natural trigger of Type-I critical collapse: black holes from neutron stars deemed stable. https://arxiv.org/abs/2611.04679

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