Mathematics – Logic
Scientific paper
Sep 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aspc..126..453v&link_type=abstract
Proceedings of the First Moroccan School of Astrophysics, Casablanca : From Quantum Fluctuations to Cosmological Structures, edi
Mathematics
Logic
1
Cosmology, Gravitational Lensing, Microlensing, Machos, Time Delay
Scientific paper
This Chapter presents a brief overview of the main concepts required to understand phenomena associated with strong gravitational lensing, from the formation of multiple images of distant quasars to the microlensing of stars within the Galaxy, and from the arcs in clusters of galaxies to the determination of Hubble's parameter. After a brief history of the subject, the general relativistic calculation of the deflection is derived, followed by a short primer on image formation by macrolenses. Gravitational microlensing in the Galaxy is then briefly reviewed. The effectiveness of the gravitational deflection of light emerges as an ideal diagnostic tool to map the mass distributions in the universe.
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