Quantum mechanics versus equivalence principle
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American Physical Society (APS)
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We consider the scattering of a photon by a weak gravitational field, treated as an external field, up to second order of the perturbation expansion. The resulting cross section is energy dependent which indicates a violation of Galileo's equivalence principle (universality of free fall) and, consequently, of the classical equivalence principle. The deflection angle θ for a photon passing by the sun is evaluated afterward and the likelihood of detecting ΔθθE≡θ-θEθE (where θE is the value predicted by Einstein's geometrical theory for the light bending) in the foreseeable future, is discussed. © 2008 The American Physical Society.
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Physical Review D - Particles, Fields, Gravitation and Cosmology, v. 78, n. 6, 2008.
