Direct Detection of Primordial Gravitational Waves in a BSI Inflationary Model

Abstract

We investigate the possibility for a direct detection by future space interferometers of the stochastic gravitational wave (GW) background generated during the inflationary stage in a class of viable $\Lambda$CDM BSI models. At frequencies around $10^{-3}$Hz, maximal values ${\Omega }_{gw}(\nu )\sim 3\times 10^{-15}$ are found, an improvement of about one order of magnitude compared to single-field, slow-roll inflationary models. This is presumably not sufficient in order to be probed in the near future.

Comments: to appear in Phys. Lett. B, (uses LaTeX, 10 pages)