Observed effects of gravitational microlensing of stars by a spatial-temporal tunnel |
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| Authors: | M B Bogdanov A M Cherepashchuk |
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| Institution: | (1) Chernyshevsky University, Saratov, Russia;(2) Sternberg Astronomical Institute, Universitetskii pr. 13, Moscow, 119899, Russia |
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| Abstract: | We consider microlensing of stars by a spacetime tunnel (wormhole), which is manifest as a gravitational lens with negative mass and a circular caustic in the source plane. If a source with a small angular size does not cross the circular caustic, it is impossible to discriminate between gravitational lenses with positive and negative mass. Even for comparatively large stellar angular diameters, differences from a Schwarzschild lensing curve are on the order of the observational errors. When the angular size of a star is comparable to the radius of the Einstein cone, for a sufficiently large impact parameter, the shape of the observed light curves can be similar to that due to microlensing of a compact object surrounded by an extended gaseous envelope. Such an object can be easily distinguished from a negative-mass gravitational lens via analysis of chromatic and polarization effects of the lensing. |
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