Defocusing gravitational microlensing
- 1 August 1997
- journal article
- research article
- Published by IOP Publishing in Physica Scripta
- Vol. 56 (2) , 212-220
- https://doi.org/10.1088/0031-8949/56/2/007
Abstract
We introduce the notion of defocusing gravitational lens considering a MACHO located behind a light source with respect to an observer. The consequence of defocusing effect is a temporal variability of star luminosity which produces a gap instead of a peak as tell-tale signature in the light curve. A general theory of (de)focusing rays (geodesics) in a gravitational field is presented. Furthermore, we give estimations of the mass of the lens and the optical depth connected to such phenomenon.Keywords
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