5 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Universe"  
Results: 1 - 5
open access

Effect of inflation on anisotropic cosmologies

Description: The effects of anisotropic cosmologies on inflation are studied. By properly formulating the field equations it is possible to show that any model that undergoes sufficient inflation will become isotropic on scales greater than the horizon today. Furthermore, we shall show that it takes a very long time for anisotropies to become visible in the observable part of the Universe. It is interesting to note that the time scale will be independent of the Bianchi Model and of the initial anisotropy. 6… more
Date: March 1, 1986
Creator: Jensen, L.G. & Stein-Schabes, J.A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Finite Temperature Instability for Compactification

Description: We consider finite temperature effects upon theories with extra dimensions compactified via vacuum stress energy (Casimir) effects. For sufficiently high temperature, a static configuration for the internal space is impossible. At somewhat lower temperatures, there is an instability due to thermal fluctuations of radius of the compact dimensions. For both cases, the Universe can evolve to a de Sitter-like expansion of all dimensions. Stability to late times constrains the initial entropy of the… more
Date: March 1, 1986
Creator: Accetta, F. S. & Kolb, E. W.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Possible Significance of a New Dimensionless Ratio in Cosmology

Description: Observations suggest that the mass density of the Universe is dominated, not by ordinary matter, but by exotic particles which are a relic of the Big Bang. In this case, a new dimensionless cosmological ratio arises, the ratio of the mass density in ordinary matter to that in exotic matter, whose value is about 0.1. A priori it might seem remarkable that this ratio should be so close to unity. However, we point out that, for many exotic dark matter candidates, the ratio is related to the fundam… more
Date: May 1, 1986
Creator: Turner, M. S. & Carr, B. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Double Inflation

Description: The Zel'dovich spectrum of adiabatic density perturbations is a generic prediction of inflation. There is increasing evidence that when the spectrum is normalized by observational data on small scales, there is not enough power on large scales to account for the observed large-scale structure in the Universe. Decoupling the spectrum on large and small scales could solve this problem. As a means of decoupling the large and small scales we propose double inflation (i.e., two episodes of inflation… more
Date: April 1, 1986
Creator: Silk, J. & Turner, M. S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Kinematic tests of exotic flat cosmological models

Description: Theoretical prejudice and inflationary models of the very early Universe strongly favor the flat, Einstein-deSitter model of the Universe. At present the observational data conflict with this prejudice. This conflict can be resolved by considering flat models of the Universe which possess a smooth component by energy density. We study in detail the kinematics of such models, where the smooth component is relativistic particles, a cosmological term, a network of light strings, or fast-moving, li… more
Date: May 1, 1986
Creator: Charlton, Jane C. & Turner, Michael S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen