We derive an expression for the luminosity distance in a perturbed Friedmann universe. We definethe correlation function and the power spectrum of the luminosity distance fluctuations and expressthem in terms of the initial spectrum of the Bardeen potential. We present semi-analytical resultsfor the case of a pure CDM (cold dark matter) universe. We argue that the luminosity distancepower spectrum represents a new observational tool which can be used to determine cosmologicalparameters. In addition, our results shed some light into the debate whether second order smallscale fluctuations can mimic an accelerating universe. …

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