Galactic-center S-Stars as a prospective test of the Einstein Equivalence Principle

Details Galactic-center S-Stars as a prospective test of the Einstein Equivalence Principle Galactic-center S-Stars as a prospective test of the Einstein Equivalence Principle

2011-05-04

arxiv.org/abs/1105.0918v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

4 pages, 2 figures, accepted for publication in Astrophysical Journal Letters

Scientific paper

The S-Stars in the Galactic-center region are found to be on near-perfect Keplerian orbits around presumably a supermassive black hole, with periods of 15-50 yr. Since these stars reach a few percent of light speed at pericenter, various relativistic effects are expected, and have been discussed in the literature. We argue that an elegant test of the Einstein equivalence principle should be possible with existing instruments, through spectroscopic monitoring of an S-star concentrated during the months around pericenter, supplemented with an already-adequate astrometric determination of the inclination. In essence, the spectrum of an S-star can be considered a heterogeneous ensemble of clocks in a freely-falling frame, which near pericenter is moving at relativistic speeds.

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