Non-Gaussianity in island cosmology

Journal Article · Wed Apr 15 00:00:00 EDT 2009 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.79.083512· OSTI ID:21308269

Yunsong, Piao ^[1]

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1. College of Physical Sciences, Graduate School of Chinese Academy of Sciences, Beijing 100049 (China)

In this paper we fully calculate the non-Gaussianity of primordial curvature perturbation of the island universe by using the second order perturbation equation. We find that for the spectral index n{sub s}{approx_equal}0.96, which is favored by current observations, the non-Gaussianity level f{sub NL} seen in an island will generally lie between 30 and 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 mean the coming observations, especially the measurement of non-Gaussianity, will be significant to clarify how our position in the landscape is populated.

• OSTI ID: 21308269
• Journal Information: Physical Review. D, Particles Fields, Vol. 79, Issue 8; Other Information: DOI: 10.1103/PhysRevD.79.083512; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
COMPUTERIZED SIMULATION
COSMOLOGY
DISTURBANCES
EQUATIONS
PERTURBATION THEORY
UNIVERSE