Fast neutrino cooling of nuclear pasta in neutron stars: Molecular dynamics simulations

Zidu Lin, Matthew E. Caplan, Charles J. Horowitz, Cecilia Lunardini

Research output: Contribution to journalArticlepeer-review

Abstract

The direct Urca process of rapid neutrino emission can occur in nonuniform nuclear pasta phases that are expected in the inner crusts of neutron stars. Here, the periodic potential for a nucleon in nuclear pasta allows momentum conservation to be satisfied for direct Urca reactions. We improve on earlier work by modeling a rich variety of pasta phases (gnocchi, waffle, lasagna, and anti-spaghetti) with large-scale molecular dynamics simulations. We find that the neutrino luminosity due to direct Urca reactions in nuclear pasta can be 3 to 4 orders of magnitude larger than that from the modified Urca process in the NS core. Thus neutrino radiation from pasta could dominate radiation from the core and this could significantly impact the cooling of neutron stars.

Original languageEnglish (US)
Article number045801
JournalPhysical Review C
Volume102
Issue number4
DOIs
StatePublished - Oct 6 2020

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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