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Gravitational Lensing as Probe of Large Scale Structure
of the Universe
V.B.Bhatia
University of Delhi, India
Gravitational lenses are now recognized as important cosmologi­
cal tools to probe the large scale structure of the universe. We
use lensing statistics to constrain the cosmological
parameter\Omega \Lambda ,
to place limits on the average red­shift (! z ?) of gamma­ray
bursters (GRBs), and to discriminate among the various models
of galaxy evolution. We calculate the number of lenses formed in
non­evolving model and in models in which galaxies evolve by fast
or slow merging or by accreting matter from their surroundings.
We find the value
of\Omega \Lambda which is consistent with other estimates.
We show that the upper limit on ! z ? is higher in models in
which galaxies are evolving. We calculate the distribution of lens
image separation in various models of galaxy evolution and com­
pare the results with the HST Snapshot Survey. We show that
the Survey does not favour the fast merging models, while the
mass accretion and non­evolving models may be able to explain
the observed small angle separation.
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