Abstract:
In this paper it is suggested that inclusion of mutual
gravitational interactions among the particles in the
early dense universe can lead to a ‘pre-big bang’ scenario,
with particle masses greater than the Planck mass implying
an accelerating phase of the universe, which then goes into
the radiation phase when the masses fall below the Planck
mass. The existence of towers of states of such massive particles
(i.e. multiples of Planck mass) as implied in various
unified theories, provides rapid acceleration in the early universe,
similar to the usual inflation scenario, but here the
expansion rate goes over ‘smoothly’ to the radiation dominated
universe when temperature becomes lower than the
Planck temperature.
