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We provide a new perspective on the pseudogap physics for attractive fermionsas described by the three-dimensional Hubbard model. The pseudogap in thesingle-particle spectral function, which occurs for temperatures above thecritical temperature $T_c$ of the superfluid transition, is often interpretedin terms of preformed, uncondensed pairs. Here we show that the occurrence ofpseudogap physics can be consistently understood in terms of local excitationswhich lead to a splitting of the quasiparticle peak for sufficiently largeinteraction. This effect becomes prominent at intermediate and hightemperatures when the quantum mechanical hopping is incoherent. We clarify theexistence of a conjectured temperature below which pseudogap physics isexpected to occur. Our results are based on approximating the physics of thethree-dimensional Hubbard model by dynamical mean field theory calculations anda momentum independent self-energy. Our predictions can be tested withultracold atoms in optical lattices with currently available temperatures andspectroscopic techniques.

Local origin of the pseudogap in the attractive Hubbard model