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Short-Range Correlations and Urca Process in Neutron Stars

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arxiv 2406.16183 v3 pith:AECUKUEE submitted 2024-06-23 nucl-th astro-ph.HE

Short-Range Correlations and Urca Process in Neutron Stars

classification nucl-th astro-ph.HE
keywords starsurcacompactfractionneutron-protonprocessprotoncorrelations
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Recent measurements of high-momentum correlated neutron-proton pairs at JLab suggest that the dense nucleonic component of the compact stars contains a fraction of high-momentum neutron-proton pairs that is not accounted for in the familiar Fermi-liquid theory of the neutron-proton fluid mixture. We compute the rate of the Urca process in compact stars taking into account the non-Fermi liquid contributions to the proton's spectral widths induced by short-range correlations. The Urca rate differs strongly from the Fermi-liquid prediction at low temperatures, in particular, the high threshold on the proton fraction precluding the Urca process in neutron stars is replaced by a smooth increase with the proton fraction. This observation may have a profound impact on the theories of cooling of compact stars.

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Cited by 4 Pith papers

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