dorsal/arxiv
View SchemaOccurrence of Hyperon Superfluidity in Neutron Star Cores
| Authors | Tatsuyuki Takatsuka, Shigeru Nishizaki, Yasuo Yamamoto, Ryozo Tamagaki |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0601043 |
| URL | https://arxiv.org/abs/nucl-th/0601043 |
| DOI | 10.1143/PTP.115.355 |
| Journal | Prog.Theor.Phys. 115 (2006) 355-379 |
Abstract
Superfluidity of $\Lambda$ and $\Sigma^-$ admixed in neutron star (NS) cores is investigated realistically for hyperon ($Y$)-mixed NS models obtained using a $G$-matrix-based effective interaction approach. Numerical results for the equation of state (EOS) with the mixing ratios of the respective components and the hyperon energy gaps including the temperature dependence are presented. These are meant to serve as physical inputs for $Y$-cooling calculations of NSs. By paying attention to the uncertainties of the EOS and the $YY$ interactions, it is shown that both $\Lambda$ and $\Sigma^-$ are superfluid as soon as they appear although the magnitude of the critical temperature and the density region where superfluidity exists depend considerably on the $YY$ pairing potential. Considering momentum triangle condition and the occurrence of superfluidity, it is found that a so-called `` hyperon cooling\rq\rq~(neutrino-emission from direct Urca process including $Y$) combined with $Y$-superfluidity may be able to account for observations of the colder class of NSs. It is remarked that $\Lambda$-hyperons play a decisive role in the hyperon cooling scenario. Some comments are given regarding the consequences of the less attractive $\Lambda\Lambda$ interaction recently suggested by the `` NAGARA event\rq\rq~$^6_{\Lambda\Lambda}$He.
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"abstract": "Superfluidity of $\\Lambda$ and $\\Sigma^-$ admixed in neutron star (NS) cores\nis investigated realistically for hyperon ($Y$)-mixed NS models obtained using\na $G$-matrix-based effective interaction approach. Numerical results for the\nequation of state (EOS) with the mixing ratios of the respective components and\nthe hyperon energy gaps including the temperature dependence are presented.\nThese are meant to serve as physical inputs for $Y$-cooling calculations of\nNSs. By paying attention to the uncertainties of the EOS and the $YY$\ninteractions, it is shown that both $\\Lambda$ and $\\Sigma^-$ are superfluid as\nsoon as they appear although the magnitude of the critical temperature and the\ndensity region where superfluidity exists depend considerably on the $YY$\npairing potential. Considering momentum triangle condition and the occurrence\nof superfluidity, it is found that a so-called `` hyperon\ncooling\\rq\\rq~(neutrino-emission from direct Urca process including $Y$)\ncombined with $Y$-superfluidity may be able to account for observations of the\ncolder class of NSs. It is remarked that $\\Lambda$-hyperons play a decisive\nrole in the hyperon cooling scenario. Some comments are given regarding the\nconsequences of the less attractive $\\Lambda\\Lambda$ interaction recently\nsuggested by the `` NAGARA event\\rq\\rq~$^6_{\\Lambda\\Lambda}$He.",
"arxiv_id": "nucl-th/0601043",
"authors": [
"Tatsuyuki Takatsuka",
"Shigeru Nishizaki",
"Yasuo Yamamoto",
"Ryozo Tamagaki"
],
"categories": [
"nucl-th"
],
"doi": "10.1143/PTP.115.355",
"journal_ref": "Prog.Theor.Phys. 115 (2006) 355-379",
"title": "Occurrence of Hyperon Superfluidity in Neutron Star Cores",
"url": "https://arxiv.org/abs/nucl-th/0601043"
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