Abstract
A model in which a gap forms in the renormalized electronic density ofstate (DOS) with missing states recovered just above the pseudogapΔpg is able to give a robust description of the striking, triangular peak seen in the real part ofthe optical self-energy of underdoped cuprates. We use this model to explore theeffect of the pseudogap on the real part of the optical conductivity and on thepartial sum rule associated with it. An important result is that the optical spectralweight redistributes over a much larger frequency window than it does in the DOS.
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