Cosmological perturbations in inflationary-universe models

1984 ◽  
Vol 29 (10) ◽  
pp. 2172-2190 ◽  
Author(s):  
Robert Brandenberger ◽  
Ronald Kahn
Keyword(s):  
Inflationary Universe ◽  
Cosmological Perturbations ◽  
Universe Models

scholarly journals Inflationary universe models and clustering of quasar red shifts

1986 ◽  
Vol 119 ◽  
pp. 509-510
Author(s):  
C. Sivaram
Keyword(s):  
Cosmological Model ◽  
Early Universe ◽  
Hubble Constant ◽  
Matter Density ◽  
Inflationary Universe ◽  
Expansion Phase ◽  
Exponential Expansion ◽  
The Universe ◽  
Inflationary Models ◽  
Universe Models

Recently it has been shown that many of the puzzling features of conventional cosmological models (such as the horizon and flatness problems) could be explained by invoking inflationary models of the early universe with an exponential expansion phase at very early epochs. These models have the added advantage that they are able to make a definite prediction about the present matter density in the universe, i.e. they require that the density be exactly equal to the closure density which in turn can be easily estimated from the Hubble constant now known to within a factor of two. Now if one goes back to an earlier idea that explored the possibility of unusual clustering of quasar redshifts around z = 2 or 3, we get an example of another cosmological model with a definite prediction for the present overall matter density. This is a modified version of the Eddington-Lemaitre type of model which naturally accommodates such features as a clustering of quasars at certain epochs. From these models one can get a prediction for the present matter density which would be an involved function of the Hubble constant and the redshifts at which such clustering occurs. It can be shown that if such clustering had occurred at any z, the present matter density predicted would be substantially smaller than the corresponding closure density. The conclusion is that any clustering of quasar redshifts is incompatiable with inflationary universe models, indirectly providing observational support for these new theories.

Cosmological perturbations in the inflationary universe

1987 ◽  
Vol 193 (4) ◽  
pp. 427-432 ◽  
Author(s):  
V.F. Mukhanov ◽  
L.A. Kofman ◽  
D.Yu. Pogosyan
Keyword(s):  
Inflationary Universe ◽  
Cosmological Perturbations

Viscous inflationary universe models

1990 ◽  
Vol 173 (2) ◽  
pp. 191-225 ◽  
Author(s):  
�. Gr�n
Keyword(s):  
Inflationary Universe ◽  
Universe Models
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