Collective Excitations from the Balian-Werthamer State

Abstract

Collective excitations from the p-wave Balian-Werthamer state at T=O are investigated by constructing the Bethe-Salpeter equation for two particle Green's function. Density fluctuation and spin density fluctuation are found to propagate with sound wave like energy spectra. In addition to these modes,. there exist excitations with the energy gaps at k=O of which the values are independent of the coupling constants. A quasiparticle bound state whose binding energy dep~nds on the coupling constants is also obtained. 1. Introduction