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Dark matter or violations of the Einstein equivalence principle influence themotion of atoms, their internal states as well as electromagnetic fields, thuscausing a signature in the signal of atomic detectors. To model such newphysics, we introduce dilaton fields and study the modified propagation oflight used to manipulate atoms in light-pulse atom interferometers. Theirinterference signal is dominated by the matter's coupling to gravity and thedilaton. Even though the electromagnetic field contributes to the phase, noadditional dilaton-dependent effect can be observed. However, the light'spropagation in gravity enters via a modified momentum transfer and its finitespeed. For illustration, we discuss effects from light propagation and thedilaton on different atom-interferometric setups, including gradiometers,equivalence principle tests, and dark matter detection.

Light propagation and atom interferometry in gravity and dilaton fields