Inflation in string-inspired cosmology and suppression of CMB low multipoles

Details Inflation in string-inspired cosmology and suppression of CMB low multipoles Inflation in string-inspired cosmology and suppression of CMB low multipoles

2003-12-12

arxiv.org/abs/hep-th/0312139v1

Class.Quant.Grav. 21 (2004) 4455-4461

Physics

High Energy Physics

High Energy Physics - Theory

4pages, 2figures

Scientific paper

We construct a string-inspired nonsingular cosmological scenario in which an inflaton field is driven up the potential before the graceful exit by employing a low-energy string effective action with an orbifold compactification. This sets up an initial condition for the inflaton to lead to a sufficient amount of $e$-foldings and to generate a nearly scale-invariant primordial density perturbation during slow-roll inflation. Our scenario provides an interesting possibility to explain a suppressed power spectrum at low multipoles due to the presence of the modulus-driven phase prior to slow-roll inflation and thus can leave a strong imprint of extra dimensions in observed CMB anisotropies.

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