Year: 2025
Type: article
Abstract: In confined hadronic matter, the spontaneous breaking and restoration of chiral symmetry can be described by considering nucleons, ${N}_{+}(939)$, and excited states of opposite parity, ${N}_{\ensuremath{-}}(1535)$. In a cold, dense hadronic phase where chiral symmetry remains spontaneously broken, direct Urca decay processes involving the ${N}_{\ensuremath{-}}$ are possible, e.g., ${N}_{\ensuremath{-}}\ensuremath{\rightarrow}{N}_{+}+{e}^{\ensuremath{-}}+{\overline{\ensuremath{\nu}}}_{e}$. We show that at low temperature and moderate densities, because the ${N}_{\ensuremath{-}}$ are much heavier than the ${N}_{+}$, such cooling dominates over standard ${N}_{+}$ direct Urca processes. This provides a strong astrophysical signature of the pattern of chiral symmetry restoration in neutron stars.
Source: Physical Review Letters
DOI: 10.1103/bf66-1hr5
Authors: Liam Brodie, Robert D. Pisarski
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G111697547, G1538770391, G222768804, G241279073, COLOR SUPERCONDUCTIVITY IN HIGH DENSITY QUARK MATTER, SIGNATURES OF COLOR SUPERCONDUCTIVITY IN HIGH-DENSITY QUARK MATTER, G2917895714, G3260240410, G357145406, G473123490, G5765906131, G601061201, G6017181652, G7463374569, SIGNATURES OF COLOR SUPERCONDUCTIVITY IN HIGH-DENSITY QUARK MATTER, G7619220232, G8570346810, G968870323
OpenAlex ID: W4414958919