Non-Gaussianity in Island Cosmology

Abstract

In this paper we fully calculate the non-Gaussianity of primordial curvature perturbation of island universe by using the second order perturbation equation. We find that for the spectral index $n_s\simeq 0.96$, which is favored by current observations, the non-Gaussianity level $f_{NL}$ seen in island will generally lie between 30 $\sim$ 60, which may be tested by the coming observations. In the landscape, the island universe is one of anthropically acceptable cosmological histories. Thus the results obtained in some sense means the coming observations, especially the measurement of non-Gaussianity, will be significant to make clear how our position in the landscape is populated.

5 pages, 1 eps figure, some discussions added, published version

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• Evolution of Metric Perturbations in Quintom Bounce model
• A Galileon Design of Slow Expansion
• Inflation in Entropic Cosmology: Primordial Perturbations and non-Gaussianities
• Non-Gaussianities of Single Field Inflation with Non-minimal Coupling
• Adiabatic Spectra During Slowly Evolving
• Phantom Inflation with A Steplike Potential
• Internal structure of cuscuton Bloch brane
• Galilean Islands in Eternally Inflating Background