No birefringence in Einstein's gravity

Details No birefringence in Einstein's gravity No birefringence in Einstein's gravity

1995-05-22

arxiv.org/abs/astro-ph/9505100v1

Astronomy and Astrophysics

Astrophysics

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Scientific paper

Einstein's theory predicts that, massive test particles with non-zero spin or angular momentum, in an external gravitation field, follow geodesics which depend upon the orientation of the spin-angular momentum . It has been claimed that such an effect also holds for photons i.e. photons with different helicities follow different geodesics in the gravitational field of a rotating body and would give rise to a polarisation dependent deflection of light passing in the vicinity of the sun or a polarisation dependent time delay of pulsar signals . We show here that contrary to earlier claims , in Einstein's gravity there is no birefringence and photons follow null geodesics irrespective of polarisation. Thus if gravitational birefringence is ever observed experimentally it would be a signal of new physics beyond Einstein's gravity

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