$\alpha$-vacuum and inflationary bispectrum

Abstract

In this paper, we discuss the non-Guassianity originated from the $\alpha$-vacuum on the CMB anisotropy. For $\alpha$-vacuum, there exist correlation between points in the acausal two patches of de Sitter spactime. Such kind of correlation can lead to large local form non-Guassianity in $\alpha$-vacuum. For the single field slow-roll inflationary scenario, the spacetime is in a quasi-de Sitter phase during the inflation. We will show that the $\alpha$-vacuum in this case will lead to non-Gaussianity with distinguished feature, of a large local form and a very different shape.

39 pages, 8 figures, references added, minor changes, accepted by Phys.Rev.D

References in corpus (10)

• Non-Gaussianities in New Ekpyrotic Cosmology
• Non-Gaussianity from Preheating
• Primordial Non-Gaussianities of General Multiple Field Inflation
• On the Issue of the ζSeries Convergence and Loop Corrections in the Generation of Observable Primordial Non-Gaussianity in Slow-Roll Inflation. Part I: the Bispectrum
• Large Non-Gaussianity Implication for Curvaton Scenario
• The Pursuit of Non-Gaussian Fluctuations in the Cosmic Microwave Background
• String Gas Cosmology and Non-Gaussianities
• Backreaction in trans-Planckian cosmology: renormalization, trace anomaly and selfconsistent solutions
• Generalized Space-time Noncommutative Inflation
• Revisiting non-Gaussianity of multiple-field inflation from the field equation

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