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We compare efforts to extract self energies and fluctuation spectra of thecuprates using optical and photoemission techniques. The fluctuations havecontributions from both the coherent and incoherent parts of the band, whichare spread over the full bare bandwidth of >2eV. Many experimental studiesconcentrate on the coherent part of the band and hence miss higher energyfluctuations. Our study establishes the universal presence of high energybosonic fluctuations across various spectroscopies as a key ingredient in thehigh temperature superconducting cuprates.

Self Energy and Fluctuation Spectra in Cuprates: Comparing Optical and Photoemission Results