scholarly journals Quantization of Friedmann cosmological models with two fluids: Dust plus radiation

2005 ◽  
Vol 344 (2-4) ◽  
pp. 131-143 ◽  
Author(s):  
N. Pinto-Neto ◽  
E. Sergio Santini ◽  
F.T. Falciano
Keyword(s):  
Cosmological Models ◽  
Two Fluids ◽  
Friedmann Cosmological Models

scholarly journals Isotropization of Homogeneous Cosmological Models

1974 ◽  
Vol 63 ◽  
pp. 273-282
Author(s):  
I. D. Novikov
Keyword(s):  
Large Scale ◽  
Background Radiation ◽  
Cosmological Models ◽  
Matter Distribution ◽  
Cosmological Singularity ◽  
Universe Expand ◽  
Starting Point ◽  
Microwave Background Radiation ◽  
Friedmann Cosmological Models ◽  
The Universe

Observations primarily of the microwave background radiation show that the Universe expands isotropically with a high degree of accuracy at the present time and that the matter distribution is homogeneous on a large scale. Thus, the Friedmann cosmological models are a good approximation today for the expanding Universe. This is valid for at least some period of time in the past too. But how did the Universe expand and what was the matter distribution close to the starting point, near the cosmological singularity?

scholarly journals Cosmological Models with Two Fluids. II. Conformal and Conformally Flat Metrics

1972 ◽  
Vol 25 (1) ◽  
pp. 83 ◽  
Author(s):  
CBG McIntosh ◽  
JM Foyster
Keyword(s):  
Cosmological Models ◽  
Conformally Flat ◽  
Elementary Functions ◽  
Two Fluids ◽  
Usual Form ◽  
Walker Metric ◽  
Similar Solutions ◽  
Conformally Flat Metrics ◽  
Two Fluid

Similar solutions to those in Part I are given for two-fluid cosmological models when the Robertson?Walker metric in its usual form is replaced by "conformal" and "conformally flat" forms. In these cases the solutions can be written in terms of elementary functions when (3v1?2)/(3v2?2) = 1?m?1, m = 1,2,3,... The relation of these solutions to one-fluid solutions with k = � 1 is also discussed.

scholarly journals The Compatibility of Friedmann Cosmological Models with Observed Properties of Gamma‐Ray Bursts and a Large Hubble Constant

1996 ◽  
Vol 472 (1) ◽  
pp. 25-33 ◽  
Author(s):  
John M. Horack ◽  
Thomas M. Koshut ◽  
Robert S. Mallozzi ◽  
A. Gordon Emslie ◽  
Charles A. Meegan
Keyword(s):  
Gamma Ray ◽  
Hubble Constant ◽  
Cosmological Models ◽  
Gamma Ray Bursts ◽  
Friedmann Cosmological Models
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