Speaker
Description
In the most equation of state the electron chemical potential in the neutron star (NS) matter reaches the value of the free pion mass already at rather moderate baryon densities. That would lead to pionization of the NS matter when negative pions replace electrons. The repulsive s-wave pi- -neutron interaction could prevent it. We apply the effective chiral Lagrangian at the second chiral order to construct the pion polarization operator. The pion spectrum is calculated, and the possibility of the s-wave pion condensation is analyzed for various forms of the nuclear symmetry energy. Also, the possibility of the p-wave (pi+) and (p+-pi-) condensation is reinvestigated. Some old classical results are revised, and new spectral branches are discussed.
