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Cosmic Acceleration: A Natural Remedy
For Horizon And Flatness Problems ?
Abhas Mitra
Theoretical Physics Div., BARC, Mumbai, India
The standard big bang cosmology has been greatly successful in
explaining many observational aspects of the real universe. How-
ever, two great diфculties faced by it are the so-called \horizon"
and \ atness" problems. By assuming that the recently found
cosmic acceleration to be a genuine and ever present eect, we
show that, the resultant modied Friedman model, is naturally
free from both the above referred problems; and there is no need to
invoke an additional \in ationary" initial phase as a seperare in-
gredient. The important cosmological milestones of the standard
big bang cosmology (which predicts cosmic deceleration) like GUT
symmetry breaking epoch or radiation matter decoupling epoch
remain unchanged in the modied cosmology in terms of redshift
values. However, in terms of cosmic time t, all such epochs occur
earlier as the universe becomes older in this case.
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