My research centers on the role of gravity in cosmology: I use gravitational lensing and classical dynamics to study the mass distribution in the Universe, from sub-galactic to super-cluster scales, to constrain cosmological parameters, and to elucidate the nature of dark matter and dark energy.
I use gravitationally lensed images
of very distant objects, quasars and galaxies, to map out in
detail the mass distribution of the intervening dark matter
in galaxies and clusters of galaxies.
Lensing is by far the best tool for the purpose of mapping out
the mass distribution, as it does not
rely on assumptions about the physical state of the mass.
Prasenjit Saha's Interactive Lens Model
Here is a short microlensing movie
with an explanation of what you see.
Classical dynamics is a powerful means of addressing the
problem of formation, evolution and relaxation of individual
galaxies and clusters of galaxies. I am using analytical
and semi-analytical techniques to gain better understanding
of dark matter halos.
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