Gravitational wave constraints on multi-brane inflation
- Astronomy Unit, School of Mathematical Sciences, Queen Mary, University of London, Mile End Road, London E1 4NS (United Kingdom)
- Centre for Research in String Theory, Department of Physics, Queen Mary, University of London, Mile End Road, London E1 4NS (United Kingdom)
- Department of Physics and Astronomy, University of Victoria, Victoria, BC, V8P 1A1 (Canada)
A class of non-canonical inflationary models is identified, where the leading-order contribution to the non-Gaussianity of the curvature perturbation is determined by the sound speed of the fluctuations in the inflaton field. Included in this class of models is the effective action for multiple coincident branes in the finite n limit. The action for this configuration is determined using a powerful iterative technique, based upon the fundamental representation of SU(2). In principle the upper bounds on the tensor-scalar ratio that arise in the standard, single-brane DBI inflationary scenario can be relaxed in such multi-brane configurations if a large and detectable non-Gaussianity is generated. Moreover models with a small number of coincident branes could generate a gravitational wave background that will be observable in future experiments.
- OSTI ID:
- 22156629
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2008, Issue 05; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
Similar Records
Primordial non-Gaussianity and gravitational waves: Observational tests of brane inflation in string theory
Phenomenology of D-brane inflation with general speed of sound