Defocusing gravitational microlensing

Details Defocusing gravitational microlensing Defocusing gravitational microlensing

1996-10-21

arxiv.org/abs/astro-ph/9610161v1

Phys.Scripta 56 (1997) 212-220

Astronomy and Astrophysics

Astrophysics

19 pages, latex, submitted to Physica Scripta

Scientific paper

10.1088/0031-8949/56/2/007

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. 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 a phenomenon.

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