Equation of State of Protoneutron Star with Trapped Neutrinos

The influence of trapped neutrinos on the proto-neutron star is studiedin the framework of relativistic mean-field theory. The results show thattrapped neutrinos increase proton fraction and make the equation of ๏๏state of neutron star matter softer when neglecting hyperonic freedom,while suppress the appearance of hyperons and make the equation of statestiffer when including hyperons in the protoneutron star. The maximum mass,compared with cold neutron star which is in beta equilibrium, decreases by0.06_{M_{odot}} for non-strange protoneutron star while increases by0.21_{M_{odot}} for protoneutron star with hyperons when the relativenumber of trapped neutrino is 0.4.