Cooling of Hyperonic Neutron Stars with Antikaons

We discuss the impact of hyperons on the neutrino emitting and the gross cooling features of neutron stars with K⁻ and K⁰ condensations. The results show that hyperons change the density ranges of the direct Urca process with nucleons and the Urca processes of K⁻ and K⁰ condensations, as well as the values of neutrino emissivity. Moreover, interactions between hyperons and antikaons make the neutrino luminosity complicated. It is found that various hyperons play different roles in neutron stars. For massive stars, Σ hyperons make the cooling slower. However, Λ can hardly change the cooling history but it reduces the mass of neutron stars.