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Stochastic inflation lattice simulations - Ultra-large scale structure of the universeNon-Gaussian fluctuations for structure formation may arise in inflation from the nonlinear interaction of long wavelength gravitational and scalar fields. Long wavelength fields have spatial gradients, a (exp -1), small compared to the Hubble radius, and they are described in terms of classical random fields that are fed by short wavelength quantum noise. Lattice Langevin calculations are given for a toy model with a scalar field interacting with an exponential potential where one can obtain exact analytic solutions of the Fokker-Planck equation. For single scalar field models that are consistent with current microwave background fluctuations, the fluctuations are Gaussian. However, for scales much larger than our observable Universe, one expects large metric fluctuations that are non-Gaussian. This example illuminates non-Gaussian models involving multiple scalar fields which are consistent with current microwave background limits.
Document ID
19930033649
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Salopek, D. S.
(NASAFermilab Astrophysics Center Batavia, IL, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Publication Information
Publication: In: Primordial nucleosynthesis and evolution of early universe; Proceedings of the International Conference, Tokyo, Japan, Sept. 4-8, 1990 (A93-17626 05-90)
Publisher: Kluwer Academic Publishers
Subject Category
Astrophysics
Accession Number
93A17646
Funding Number(s)
CONTRACT_GRANT: NAGW-1340
Distribution Limits
Public
Copyright
Other

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