scholarly journals Past extendibility and initial singularity in Friedmann-Lemaître-Robertson-Walker and Bianchi I spacetimes

2021 ◽  
Vol 2021 (07) ◽  
pp. 047
Author(s):  
Kimihiro Nomura ◽  
Daisuke Yoshida
Keyword(s):  
Initial Singularity ◽  
Bianchi I

NEW BIANCHI I MODEL

1991 ◽  
Vol 06 (01) ◽  
pp. 97-101 ◽  
Author(s):  
JOSEPH HAJJ-BOUTROS
Keyword(s):  
Bianchi Type ◽  
State Equation ◽  
Initial Singularity ◽  
Type I ◽  
Bianchi Type I ◽  
Bianchi I

We deal with a state equation depending on the cosimic time t, i.e. μ=f(t)p. The metric is of L.R. S. Bianchi type I. The obtained solution describes the initial singularity where radiation dominates and evolves into the matter-dominated regime with increasing time.

scholarly journals BIANCHI I SOLUTIONS OF EFFECTIVE QUADRATIC GRAVITY

2012 ◽  
Vol 21 (04) ◽  
pp. 1250037 ◽  
Author(s):  
DANIEL MÜLLER ◽  
JULIANO A. DE DEUS
Keyword(s):  
Numerical Solutions ◽  
Relativity Theory ◽  
De Sitter ◽  
General Relativity Theory ◽  
Spatial Metrics ◽  
Effective Gravity ◽  
Bianchi I ◽  
Quadratic Theory ◽  
Quadratic Gravity ◽  
Planck Time

It is believed that soon after the Planck time, Einstein's general relativity theory should be corrected to an effective quadratic theory. Numerical solutions for the anisotropic generalization of the Friedmann "flat" model E3 for this effective gravity are given. It must be emphasized that although numeric, these solutions are exact in the sense that they depend only on the precision of the machine. The solutions are identified asymptotically in a certain sense. It is found solutions which asymptote de Sitter space, Minkowski space and a singularity. This work is a generalization for nondiagonal spatial metrics of a previous result obtained by one of us and a collaborator for Bianchi I spaces.

scholarly journals Publisher’s Note: Smooth bounce in the affine quantization of a Bianchi I model [Phys. Rev. D91, 124002 (2015)]

2015 ◽  
Vol 91 (12) ◽  
Author(s):  
Hervé Bergeron ◽  
Andrea Dapor ◽  
Jean Pierre Gazeau ◽  
Przemysław Małkiewicz
Keyword(s):  
Bianchi I

scholarly journals Integrable cosmological models in the Einstein and in the Jordan frames and Bianchi-I cosmology

2018 ◽  
Vol 49 (1) ◽  
pp. 1-4 ◽  
Author(s):  
A. Yu. Kamenshchik ◽  
E. O. Pozdeeva ◽  
A. Tronconi ◽  
G. Venturi ◽  
S. Yu. Vernov
Keyword(s):  
Cosmological Models ◽  
Bianchi I
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