In this work we demonstrate that fluctuations of spacetime lead to an effective decoherence of a quantum particle. We derive a quantum master equation for the particle's density matrix, discuss its dissipation and decoherence properties, and estimate the corresponding decoherence time scales. By contrast to other models discussed in the literature, in the present approach the metric fluctuations give rise to a decay of the coherences in the energy representation, i.e., to a localization in energy space.
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