Abstract:
Matter collapsing to a singularity in a gravitational
field is still an intriguing question. Similar situation
arises when discussing the very early universe or a universe
recollapsing to a singularity. It was suggested that inclusion
of mutual gravitational interactions among the collapsing
particles can avert a singularity and give finite value for various
physical quantities. We also discussed how inclusion
of large dark energy term compensates for the net gravity.
The discussion is taken further by including the effects of
charge, magnetic fields and rotation. The role of large extra
dimensions under the extreme initial conditions is discussed
and possible connection with the cyclic brane theory is explored.
We constrain various cosmic quantities like the net
charge, number density of magnetic monopoles, primordial
magnetic fields, size of the extra dimensions, etc. We are
also able to arrive at the parameters governing the observed
universe.
