A New Test of the Einstein Equivalence Principle and the Isotropy of Space

Details A New Test of the Einstein Equivalence Principle and the Isotropy of Space A New Test of the Einstein Equivalence Principle and the Isotropy of Space

1995-04-20

arxiv.org/abs/gr-qc/9504032v1

Phys.Rev.D52:3168-3175,1995

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

21 pages, Latex, 3 Postscript figures

Scientific paper

10.1103/PhysRevD.52.3168

Recent research has established that nonsymmetric gravitation theories like Moffat's NGT predict that a gravitational field singles out an orthogonal pair of polarization states of light that propagate with different phase velocities. We show that a much wider class of nonmetric theories encompassed by the $\chi g$ formalism predict such violations of the Einstein equivalence principle. This gravity-induced birefringence of space implies that propagation through a gravitational field can alter the polarization of light. We use data from polarization measurements of extragalactic sources to constrain birefringence induced by the field of the Galaxy. Our new constraint is $10^8$ times sharper than previous ones.

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