= Fermi liquid
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Why can a strongly interacting liquid resemble a gas? Its low-energy excitations can be long-lived <Landau quasiparticles> near a <Fermi surface>. Normal liquid <helium-3> motivates this <Fermi liquid> description: interactions survive in effective excitation <energies> and interactions.<The Theory of a Fermi Liquid by Lev Davidovich Landau>[p.920 and section 1]{ref}
Interacting one-dimensional <fermion> systems often form <Luttinger liquids>; <non-Fermi liquids> also occur in higher dimensions. A <Cooper instability> can produce a paired phase.<Renormalization Group Approach to Interacting Fermions by Ramamurti Shankar>[Sections IV E, VI D and XI]{ref}
The <Fermi-surface renormalization-group scaling> below organizes the low-energy interactions; <zero sound> tests whether their collective dynamics survives even when collisions are rare.
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