Strong-Coupling Corrections to Collective-Mode Frequencies in Superfluid ³He-B

The frequencies of collective modes in superfluid ³He in principle provide sensitive probes of the quasiparticle interactions (Landau parameters and pairing interactions), but the interpretaqtion of experiemntal results for these frequencies has always been uncertain due to unknown corrections from non-trivial strong-coupling effects (those not subsumed in the magnitude of the order parameter). We will report perturbative calculations of corrections to to the frequency of the J^C = 2⁺ mode of ³He-B using the weak-coupling-plus model of Rainer and Serene.[1]

References:
[1] J.W. Serene and D. Rainer, Phys. Rep. 101, 221 (1983)