Probing Quantum Violations of the Equivalence Principle

Details Probing Quantum Violations of the Equivalence Principle Probing Quantum Violations of the Equivalence Principle

2000-06-06

arxiv.org/abs/gr-qc/0006022v1

Gen.Rel.Grav.33:183-194,2001

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

This essay received Fifth Award in the Annual Essay Competition of the Gravity Research Foundation for the year 2000. Gen. Rel

Scientific paper

10.1023/A:1002749217269

The joint realm of quantum mechanics and the general-relativistic description of gravitation is becoming increasingly accessible to terrestrial experiments and observations. In this essay we study the emerging indications of the violation of equivalence principle (VEP). While the solar neutrino anomaly may find its natural explanation in a VEP, the statistically significant discrepancy observed in the gravitationally induced phases of neutron interferometry seems to be the first indication of a VEP. However, such a view would seem immediately challenged by the atomic interferometry results. The latter experiments see no indications of VEP, in apparent contradiction to the neutron interferometry results. Here we present arguments that support the view that these, and related torsion pendulum experiments, probe different aspects of gravity; and that current experimental techniques, when coupled to the solar-neutrino data, may be able to explore quantum mechanically induced violations of the equivalence principle. We predict quantum violation of the equivalence principle (qVEP) for next generation of atomic interferometry experiments. The prediction entails comparing free fall of two different linear superpositions of Cesium atomic states.

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