Properties of a protoneutron star in effective field theory

The complete form of the equation of state of strangeness rich protoneutron and neutron star matter has been obtained. The currently obtained lower value of the U{sub {lambda}}{sup ({lambda})} potential at the level of 5 MeV permits the existence of additional parameter set which reproduces the weaker {lambda}{lambda} interaction. The effects of the strength of hyperon-hyperon interactions on the equations of state constructed for the chosen parameter set have been analyzed. It has been shown that replacing the strong Y-Y interaction model by the weak one introduces large differences in the composition of a protoneutron star matter both in the strange and nonstrange sectors. Also concentrations of neutrinos have been significantly altered in protoneutron star interiors. The performed calculations have indicated that the change of the hyperon-hyperon coupling constants affects the value of the proto-neutron star maximum mass.