Non-Gaussianity in Island Cosmology

Details Non-Gaussianity in Island Cosmology Non-Gaussianity in Island Cosmology

2008-07-24

arxiv.org/abs/0807.3813v2

Phys.Rev.D79:083512,2009

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

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

Scientific paper

10.1103/PhysRevD.79.083512

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.

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