Cold-dark-matter cosmology with non-Gaussian fluctuations from inflation

Journal Article · Sat Feb 15 04:00:00 EST 1992 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.45.1139· OSTI ID:7235335

Salopek, D S ^[1]

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1. Department of Applied Mathematics and Theoretical Physics, Silver Street, Cambridge CB39EW (United Kingdom) NASA/Fermilab Astrophysics Center, P.O. Box 500 MS-209, Batavia, Illinois 60510 (United States)

Non-Gaussian primordial fluctuations for structure formation may be generated during the inflationary epoch from the nonlinear interaction of two scalar fields with gravity. Semianalytical stochastic inflation calculations are described for nonlinear long-wavelength evolution in 3+1 dimensions. Long-wavelength fields are governed by a single equation, the separated Hamilton-Jacobi equation. Typically, non-Gaussian fluctuations arise when the scalar fields pass over a sharp feature in their potential surface. The subsequent evolution of these primordial fluctuations are calculated as scales reenter the horizon during the radiation-dominated and matter-dominated eras of the cold-dark-matter scenario. Contour maps for the linear density perturbation as well as the gravitational potential are displayed at the present epoch. In qualitative agreement with observations, one can construct models with enhanced sheetlike structures on the scale of {similar to}25{ital h}{sup {minus}1} Mpc. The cleanest test of non-Gaussian fluctuations will hopefully occur in the near future from large-angle microwave-background anisotropy experiments.

• OSTI ID: 7235335
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 45:4; ISSN 0556-2821; ISSN PRVDA
• Country of Publication: United States
• Language: English

Related Subjects

661310 -- Relativity & Gravitation-- (1992-)
662110* -- General Theory of Particles & Fields-- Theory of Fields & Strings-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BASIC INTERACTIONS
COMPOSITE MODELS
COSMOLOGICAL MODELS
COSMOLOGY
DIFFERENTIAL EQUATIONS
ELECTROMAGNETIC RADIATION
EQUATIONS
EXTENDED PARTICLE MODEL
FIELD THEORIES
FOUR-DIMENSIONAL CALCULATIONS
GALAXIES
GENERAL RELATIVITY THEORY
GRAVITATIONAL INTERACTIONS
HAMILTON-JACOBI EQUATIONS
HUBBLE EFFECT
INFLATIONARY UNIVERSE
INTERACTIONS
MATHEMATICAL MODELS
MATTER
MICROWAVE RADIATION
NONLUMINOUS MATTER
PARTIAL DIFFERENTIAL EQUATIONS
PARTICLE MODELS
QUANTUM FIELD THEORY
QUANTUM GRAVITY
QUARK MODEL
RADIATIONS
SCALAR FIELDS
STOCHASTIC PROCESSES
STRING MODELS