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

Gmeiner, F. and White, C.D. (2008) Dirac–Born–Infeld inflation using a one-parameter family of throat geometries. Journal of Cosmology and Astroparticle Physics, 2008(02), (doi: 10.1088/1475-7516/2008/02/012)

Abstract

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.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: White, Dr Christopher
• Authors: Gmeiner, F., and White, C.D.
• Subjects: Q Science > QC Physics
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Journal of Cosmology and Astroparticle Physics
• ISSN: 1475-7516