Eötvös Experiments with Supermassive Black Holes
Abstract
By examining the locations of central black holes in two elliptical galaxies, M\,32 and M\,87, we derive constraints on the violation of the strong equivalence principle for purely gravitational objects, i.e. black holes, of less than about twothirds, $\eta_N<0.68$ from the gravitational interaction of M\,87 with its neighbours in the Virgo cluster. Although M\,32 appears to be a good candidate for this technique, the high concentration of stars near its centre substantially weakens the constraints. On the other hand, if a central black hole is found in NGC 205 or one of the other satellite ellipticals of M\,31, substantially better constraints could be obtained. In all cases the constraints could improve dramatically with better astrometry.
 Publication:

arXiv eprints
 Pub Date:
 June 2015
 DOI:
 10.48550/arXiv.1506.07607
 arXiv:
 arXiv:1506.07607
 Bibcode:
 2015arXiv150607607A
 Keywords:

 Astrophysics  Astrophysics of Galaxies;
 Astrophysics  Cosmology and Nongalactic Astrophysics;
 General Relativity and Quantum Cosmology;
 High Energy Physics  Theory
 EPrint:
 7 pages, 3 figures, accepted by Monthly Notices