Occurrence of hyperon superfluidity in neutron star cores

Superfluidity of A and Sigma(-) admixed in neutron star (NS) cores is investigated realistically for hyperon (Y)-inixed 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 is 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 (neutrino-emission from direct Urca, process including Y) combined with Y-superfluidity may be able to account for observations of the colder class of Ms. 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 He-G(Lambda Lambda).