“…At low density, [73][74][75] or with additional approximations, 76 a pseudogap may be found. By contrast, when the q ជ ϭ0 superconducting mode is relaxational, selfconsistent T-matrix calculations 77 have failed to show a pseudogap in the one-particle spectral function A(k F ,) ϭϪ2ImG R (k F ,) when the momentum dependence of the self-energy is neglected ͑which should be valid in infinite dimension͒. In two dimensions, an absence of the pseudogap would be in sharp contrast with various QMC results 39,49 and with general physical arguments inspired by studies of the repulsive case, 53,78 which have already stressed that space dimension is crucial in the physics of pseudogap formation.…”