Evolution of a homogeneous isotropic universe, dark matter, and the absence of monopoles

1993 ◽  
Vol 94 (3) ◽  
pp. 358-366
Author(s):  
Yu. M. Loskutov
Keyword(s):  
Dark Matter ◽  
Isotropic Universe ◽  
Homogeneous Isotropic Universe

scholarly journals Cosmic Strings as a Candidate for Dark Matter. Astrophysical Formulae

1988 ◽  
Vol 130 ◽  
pp. 566-566
Author(s):  
M.P. Dabrowski ◽  
J. Stelmach
Keyword(s):  
Dark Matter ◽  
Domain Walls ◽  
Analytic Solution ◽  
Cosmic Strings ◽  
Isotropic Universe ◽  
Stable Domain ◽  
Homogeneous Isotropic Universe ◽  
Weierstrass Functions ◽  
Arbitrary Curvature

We consider homogeneous, isotropic universe with arbitrary curvature (k=0, ±1), filled with dust, radiation, ˄-term and a set of noninteracting strings (i.e. scaling as ρs ∼ R−2, hence yielding string dominated universe). For such model we find analytic solution of the Friedman equation using Weierstrass functions. We realize that addition of (rather unrealistic component) stable domain walls (ρw ∼ R−1) to the model, does not essentially complicate the calculations.

Oscillating and Inflating Universe in SO(3)-Gravitation Theory

1991 ◽  
Vol 46 (11) ◽  
pp. 967-975
Author(s):  
M. Mattes ◽  
M. Sorg
Keyword(s):  
Gravitation Theory ◽  
Isotropic Universe ◽  
Inflationary Phase ◽  
Homogeneous Isotropic Universe

AbstractThe predictions of SO (3) Gravitation Theory are studied for a homogeneous, isotropic universe. Various types of oscillations are obtained for the pre-inflationary phase, where the geometry experiences violent fluctuations. These are ultimately terminating at either re-collaps or regular inflation.

scholarly journals A MINIMAL MODEL FOR DILATONIC GRAVITY

2000 ◽  
Vol 15 (32) ◽  
pp. 1977-1990 ◽  
Author(s):  
P. P. FIZIEV
Keyword(s):  
Time Evolution ◽  
Minimal Model ◽  
Scale Factor ◽  
Tensor Model ◽  
Isotropic Universe ◽  
General Properties ◽  
Homogeneous Isotropic Universe

We study a new minimal scalar–tensor model of gravity with Brans–Dicke factor ω(Φ)≡0 and cosmological factor Π(Φ). The constraints on Π(Φ) from known gravitational experiments are derived. We show that almost any time evolution of the scale factor in a homogeneous isotropic Universe can be obtained via a properly chosen Π(Φ) and discuss the general properties of models of this type.

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