Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008mgm..conf.1716s&link_type=abstract
"THE ELEVENTH MARCEL GROSSMANN MEETING On Recent Developments in Theoretical and Experimental General Relativity, Gravitation an
Astronomy and Astrophysics
Astronomy
Scientific paper
The gravitational deviation suffered by photons passing near massive compact bodies provided one of the first observational tests of general relativity and is still considered as an excellent probe for gravity theories. Black hole lensing has been emerging as a pretty promising tool for gravitational investigations in both weak and strong fields. On the observational side, interest in this topic is mainly motivated by the super-massive black hole supposed to be hosted in the radio source Sgr A* in the Galactic center. Planned high-resolution observations at the astrometric resolution of the microarcsecond (μas) should allow in the next future a clean detection of higher order effects in gravitational lensing. It is now well understood that a photon passing near a black hole can suffer either a strong or a weak deflection. The latter occurs when the minimum distance is much larger than the gravitational radius. The former occurs when photons wind around the black hole making one or more loops and producing images very near to the shadow...
Note from Publisher: This article contains the abstract and references only.
de Luca Fabiana
Sereno Mauro
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