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Causality for first-order phase transition and its implication on the maximum mass of neutron stars

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arxiv 2410.21877 v2 pith:O7746LBC submitted 2024-10-29 astro-ph.HE

Causality for first-order phase transition and its implication on the maximum mass of neutron stars

classification astro-ph.HE
keywords phasetransitioncausalityfirst-orderstatedensitysmoothequation
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Causality is an essential factor in determining the maximum mass of a neutron star. Previous works study causality for smooth equations of state. The density at the core of neutron stars can be a few times nuclear saturation density, where the occurrence of first-order phase transition has not been ruled out. The causality condition for first-order phase transition is characteristically different from that of smooth EOS, which becomes evident in the mass-radius relation. In this letter, we find that equations of state having first-order phase transition, the causality line deviates considerably from the smooth equation of state. Depending on the onset density of phase transition, there is a narrow band in the mass-radius plot, which is available only to the stars having a smooth equation of state. This can have significant consequences in the sense that if some pulsars are to lie in this band, one can rule out the equation of state having first-order phase transition occurring at that particular onset density.

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  1. On the Possibility of a Strong First-Order Phase Transition in Neutron Stars

    nucl-th 2026-06 unverdicted novelty 5.0

    Bayesian analysis favors a strong first-order phase transition in cold dense QCD matter whose onset lies above the central density of the most massive observed neutron stars.