Abstract
The coupling of density and spin-density fluctuations to the single-particle excitations in $^{3}\mathrm{He}$ at zero temperature is studied. The present results exhibit a sharply peaked effective mass close to the Fermi surface, caused by the attractive quasiparticle interaction in the spin-1 particle-hole channel. The coupling to the zero-sound mode causes a secondary maximum around $2{k}_{\mathrm{F}}$. This mechanism can reconcile the rapid variation of the specific heat with a well-defined zero-sound mode at large momenta.
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