Diquark Condensates and Compact Star Cooling

Abstract

The effect of color superconductivity on the cooling of quark stars and\nneutron stars with large quark cores is investigated. Various known and new\nquark-neutrino processes are studied. As a result, stars being in the color\nflavor locked (CFL) color superconducting phase cool down extremely fast. Quark\nstars with no crust cool down too rapidly in disagreement with X-ray data. The\ncooling of stars being in the N_f =2 color superconducting (2SC) phase with a\ncrust is compatible with existing X-ray data. Also the cooling history of stars\nwith hypothetic pion condensate nuclei and a crust does not contradict the\ndata.\n