1106.4118 (Pyung Seong Kwon et al.)

Inflation driven by single geometric tachyon with D-brane orbiting
around NS5-branes    [PDF]

Pyung Seong Kwon, Gyeong Yun Jun, Kamal L. Panigrahi, M. Sami

We investigate models in which inflation is driven by a single geometrical tachyon. We assume that the D-brane as a probe brane in the background of NS5-branes has non-zero angular momentum which is shown to play similar role as the number of the scalar fields of the assisted inflation. We demonstrate that the angular momentum corrected effective potential allows to account for the observational constraint on COBE normalization, spectral index $n_S$ and the tensor to scalar ratio of perturbations consistent with WMAP seven years data.

View original: http://arxiv.org/abs/1106.4118