Accession Number DE2013-1063787
Title Anomalous Dimensions and Non-Gaussianity.
Publication Date 2012
Media Count 41p
Personal Author D. Green E. Silverstein L. Senatore M. Lewandowski M. Zaldarriaga
Abstract We analyze the signatures of in inflationary models that are coupled to strongly interacting field theories, a basic class of multfield models also motivated by their role in providing dynamically small scales. Near the squeezed limit of the bispectrum, we find a simple scaling behavior determined by operator dimensions, which are constrained by the appropriate unitarity bounds. Specically, we analyze two simple and calculable classes of examples: conformal field theories (CFTs), and large-N CFTs deformed by relevant time-dependent double-trace operators. Together these two classes of examples exhibit a wide range of scalings and shapes of the bispectrum, including nealy equilateral, orthogonal and local non-Gaussianity in different regimes. Along the way, we compare and contrast the shape and amplitude with previous results on weakly coupled fields coupled to inflation. In inflationary cosmology, the quantum fluctuations of the inflation. and possibly other fields, get imprinted on the power spectrum and higher point correlations accessible in the CMB and largescale structure.
Keywords Amplitudes
Conformal invariance
Correlations
Cosmology
Dimensions
Field theories
Inflationary universe
Scaling
Spectra
Unitarity


 
Source Agency Technical Information Center Oak Ridge Tennessee
NTIS Subject Category 46 - Physics
54C - Astrophysics
Corporate Author Stanford Linear Accelerator Center, CA.
Document Type Technical report
Title Note N/A
NTIS Issue Number 1319
Contract Number DE-AC02-76SF00515

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