Journal
NUCLEAR PHYSICS B
Volume 868, Issue 1, Pages 120-155Publisher
ELSEVIER
DOI: 10.1016/j.nuclphysb.2012.11.010
Keywords
Vector curvaton; D-brane inflation; Statistical anisotropy; Non-Gaussianity
Categories
Funding
- Lancaster Manchester Sheffield Consortium for Fundamental Physics under STFC grant [ST/J000418/1]
- DFG cluster of excellence Origin and Structure of the Universe
- SFB-Tansregio TR33 The Dark Universe (Deutsche Forschungsgemeinschaft)
- European Union 7th network program Unification in the LHC era [PITN-GA-2009-237920]
- BIGS-PA
- Science and Technology Facilities Council [ST/I505648/1, ST/J000418/1, ST/J501001/1, ST/G00045X/1] Funding Source: researchfish
- STFC [ST/J000418/1, ST/J501001/1, ST/G00045X/1, ST/I505648/1] Funding Source: UKRI
Ask authors/readers for more resources
We investigate the possibility of embedding the vector curvaton paradigm in D-brane models of inflation in type IIB string theory in a simple toy model. The vector curvaton is identified with the U (1) gauge field that lives on the world volume of a D3-brane, which may be stationary or undergoing general motion in the internal space. The dilaton is considered as a spectator field which modulates the evolution of the vector field. In this set-up, the vector curvaton is able to generate measurable statistical anisotropy in the spectrum and bispectrum of the curvature perturbation assuming that the dilaton evolves as e(-phi) proportional to a(2) where a(t) is the scale factor. Our work constitutes a first step towards exploring how such distinctive features may arise from the presence of several light fields that naturally appear in string theory models of cosmology. (c) 2012 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available