Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1997-05-06
Phys.Rev. D56 (1997) 4604-4609
Physics
High Energy Physics
High Energy Physics - Theory
13 pages, Latex, 3 figures included
Scientific paper
10.1103/PhysRevD.56.4604
The pre-big-bang cosmology inspired by superstring theories has been suggested as an alternative to slow-roll inflation. We analyze, in both the Jordan and Einstein frames, the effect of spatial curvature on this scenario and show that too much curvature --- of either sign --- reduces the duration of the inflationary era to such an extent that the flatness and horizon problems are not solved. Hence, a fine-tuning of initial conditions is required to obtain enough inflation to solve the cosmological problems.
Turner Michael S.
Weinberg Erick J.
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