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We calculate the optical and Raman response within a phenomenological modelof fermion quasiparticles coupled to nearly critical collective modes. We findthat, whereas critical scaling properties might be masked in optical spectradue to charge conservation, distinct critical signatures of charge and spinfluctuations can be detected in Raman spectra exploiting specific symmetryproperties. We compare our results with recent experiments on the cuprates.

Low-energy signatures of charge and spin fluctuations in Raman and optical spectra of the cuprates