Phys. Rev. D 78, 064002 (2008) [6 pages]Quantum mechanics versus equivalence principleReceived 30 October 2006; published 2 September 2008 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 Δθ/θE≡θ-θE/θE (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 URL:
http://link.aps.org/doi/10.1103/PhysRevD.78.064002
DOI:
10.1103/PhysRevD.78.064002
PACS:
03.65.Sq, 04.80.Cc
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