Dirac–Born–Infeld inflation using a one-parameter family of throat geometries

We demonstrate the possibility of examining cosmological signatures in the Dirac–Born–Infeld (DBI) inflation setup using the BGMPZ solution, a oneparameter family of geometries for the warped throat which interpolate between the Maldacena–Nu˜nez and Klebanov–Strassler solutions. The warp factor is determined numerically and is subsequently used to calculate cosmological observables, including the scalar and tensor spectral indices, for a sample point in the parameter space. As one moves away from the Klebanov–Strassler (KS) solution for the throat, the warp factor is qualitatively different, which leads to a significant change for the observables, but also generically increases the non- Gaussianity of the models. We argue that the different models can potentially be differentiated by current and future experiments