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Session E9 - Gravity Experiments and Theory.
MIXED session, Friday morning, May 03
Room 103,
Recent research has established that nonsymmetric gravitation theories like Moffat's NGT predict that a gravitational field singles out preferred directions in space. We use the \chi g formalism to analyze a much wider class of nonmetric theories which predict such a violation of the Einstein Equivalence Principle. This anisotropy implies that the energy levels of an atom in a magnetic field are shifted by an amount that is orientation dependent. We use atomic experiments to constrain anisotropy induced by the gravitational field of the sun. We compare with constraints on birefringence of space, as analyzed in a previous paper, and conclude on the status of tests of the Einstein Equivalence Principle.