Abstract:
We study the effects of the particle-hole asymmetry terms contained in the Landau-Silin equations
on the collective modes of normal 3He. We find that there are no frequency shifts, first order
in particle-hole asymmetry terms, of either the zero sound mode or the spin wave modes of normal
3He. Propagating spin waves cannot be excited by zero sound; but, because of particle-hole
asymmetry, zero sound can drive small magnetic oscillations with frequencies
ωzero-sound.