Primordial scalar perturbations in tachyonic power-law inflation
arXiv:1301.4631 · doi:10.1103/PhysRevD.89.027302
Abstract
In this work we determine the power spectrum of the gravitational potential of the primordial fluctuations for an inflationary model whose \emph{inflaton} is a non-canonical scalar field of the tachyon-type. The respective background field equations for an inverse-square potential produce a power-law inflation, and it is explicitly shown that for such a potential the power spectrum tends to be scale-independent for highly accelerated regimes in the inflationary expansion.
4 pages. Version published in PRD