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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

Armen Sedrakian This is my paper · ORCID
classification nucl-thastro-ph.HE
keywords starsurcacompactfractionneutron-protonprocessprotoncorrelations
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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 3 Pith papers

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  1. Magnetorotational instabilities in solids: Application to neutron-star crusts

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    Plane-parallel analysis finds MRI operates in solids only when magnetic tension exceeds shear modulus, requiring spin frequencies ≳300 Hz for crust amplification in neutron-star mergers.

  2. Transport properties in binary neutron star mergers: Effect of magnetic field

    nucl-th 2026-08 conditional novelty 5.0 of 10

    Magnetic fields up to 5e17 G increase charged-current neutrino and antineutrino opacities in neutron star merger matter by up to two orders of magnitude at low temperature, shrinking neutrino mean free paths.

  3. Bayesian constraints on covariant density functional equations of state of compact stars with new NICER mass-radius measurements

    hep-ph 2024-12 conditional novelty 5.0 of 10

    Bayesian fits that include the 2024 NICER results for PSR J0437 and J1231 narrow the allowed radius range for canonical-mass neutron stars to roughly 12.5 to 12.8 km in covariant density functional models.

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