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

TL;DR

This paper explores a model where inflation is driven by a single geometric tachyon associated with a D-brane orbiting NS5-branes, incorporating angular momentum effects to match observational data.

Contribution

It introduces a novel inflationary model with a single geometric tachyon influenced by angular momentum, aligning theoretical predictions with WMAP data.

Findings

Angular momentum modifies the effective potential for the tachyon.

The model can satisfy COBE normalization constraints.

Predictions are consistent with WMAP seven-year data.

Abstract

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.