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PreprintCC BY 4.0arXiv

Medium effects on neutron star modified and direct Urca cooling rates

  • B. X. Zhou
  • Jin-Biao Wei
  • Z. H. Li
  • G. F. Burgio
  • H. -J. Schulze
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Abstract

We study the effects of in-medium modification of the elementary cooling processes on observable properties of isolated neutron stars. We then deduce the neutron star mass distributions compatible with the cooling analysis and compare with current theoretical models. We conclude that current cooling data require fast direct Urca (DU) cooling, moderated by proton superfluidity, to be active in most neutron stars, and that the DU onset threshold must lie below canonical masses. In that case medium modifications of modified Urca (MU) rates are practically insignificant, but the nn Bremsstrahlung rate plays a dominant role.

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Cite

BibTeXRIS
BibTeX
@misc{zhou2026medium,
  title = {{Medium effects on neutron star modified and direct Urca cooling rates}},
  author = {B. X. Zhou and Jin-Biao Wei and Z. H. Li and G. F. Burgio and H. -J. Schulze},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.34338},
  eprint = {2609.34338},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.34338},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Medium effects on neutron star modified and direct Urca cooling rates
AU  - B. X. Zhou
AU  - Jin-Biao Wei
AU  - Z. H. Li
AU  - G. F. Burgio
AU  - H. -J. Schulze
PY  - 2026
DA  - 2026/09/28
PB  - arXiv
DO  - 10.48550/arxiv.2609.34338
UR  - https://arxiv.org/abs/2609.34338
AB  - We study the effects of in-medium modification of the elementary cooling processes on observable properties of isolated neutron stars. We then deduce the neutron star mass distributions compatible with the cooling analysis and compare with current theoretical models. We conclude that current cooling data require fast direct Urca (DU) cooling, moderated by proton superfluidity, to be active in most neutron stars, and that the DU onset threshold must lie below canonical masses. In that case medium modifications of modified Urca (MU) rates are practically insignificant, but the nn Bremsstrahlung rate plays a dominant role.
ER  -