Speaker
Description
I will introduce a new renormalisation scheme to construct the Landau quasiparticles of Fermi fluids. The scheme relies on an energy cutoff Λ which removes the quasi- resonant couplings, enabling the dressing of the particles into quasiparticles via a unitary transformation. The dynamics of the quasiparticles is then restricted to low- energy transitions and is fully determined by an effective Hamiltonian which unifies the Landau interaction function f and the collision amplitude in a single amplitude A regularized by Λ. This effective theory captures all the low-energy physics of Fermi fluids that support Landau quasiparticles, from the equation of state to the transport properties, both in the normal and in the superfluid phase. I will apply it to an atomic Fermi gas with contact interaction.