Journal
JOURNAL OF HIGH ENERGY PHYSICS
Volume -, Issue 12, Pages -Publisher
SPRINGER
DOI: 10.1007/JHEP12(2016)028
Keywords
AdS-CFT Correspondence; Cosmology of Theories beyond the SM; Gauge-gravity correspondence
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Funding
- Research Grants Council (RGC) of Hong Kong [HKUST4/CRF/13G, 16304414]
- Chulalongkorn University
- DOE [DE-FG-02-95ER40896]
- University of Wisconsin
- Hong Kong PhD Fellowship Scheme (HKPFS) by the RGC of Hong Kong
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We use holographic techniques to compute inflationary non-Gaussianities for general single-field inflation, including models with a non-trivial sound speed. In this holographic approach, the inflationary dynamics is captured by a relevant deformation of the dual conformal field theory (CFT) in the UV, while the inflationary correlators are computed by conformal perturbation theory. In this paper, we discuss the effects of higher derivative operators, such as (a, (mu) I center dot a, (mu) I center dot) (m) , which are known to induce a non-trivial sound speed and source potentially large non-Gaussianities. We compute the full inflationary bispectra from the deformed CFT correlators. We also discuss the squeezed limit of the bispectra from the viewpoint of operator product expansions. As is generic in the holographic description of inflation, our power spectrum is blue tilted in the UV region. We extend our bispectrum computation to the IR region by resumming the conformal perturbations to all orders. We provide a self-consistent setup which reproduces a red tilted power spectrum, as well as all possible bispectrum shapes in the slow-roll regime.
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