On one integrable cosmological model of the flat universe in k-essence

2021 ◽  
Vol 12 (2) ◽  
Author(s):  
K.R. Myrzakulov ◽  
D.Zh. Kenzhalin ◽  
T.R. Myrzakul
Keyword(s):  
Cosmological Model ◽  
Flat Universe

scholarly journals Global Dynamics of the Hořava–Lifshitz Cosmological Model in a Non-Flat Universe with Non-Zero Cosmological Constant

Universe ◽  
2021 ◽  
Vol 7 (11) ◽  
pp. 445
Author(s):  
Fabao Gao ◽  
Jaume Llibre
Keyword(s):  
Differential Equations ◽  
Cosmological Model ◽  
Cosmological Constant ◽  
Qualitative Theory ◽  
Global Dynamics ◽  
Model Based ◽  
Flat Universe

When the cosmological constant is non-zero, the dynamics of the cosmological model based on Hořava–Lifshitz gravity in a non-flat universe are characterized by using the qualitative theory of differential equations.

Cosmological spacetimes

2018 ◽  
Author(s):  
Nathalie Deruelle ◽  
Jean-Philippe Uzan
Keyword(s):  
Cosmological Model ◽  
Large Scale ◽  
Cosmic Time ◽  
De Sitter ◽  
Matter Distribution ◽  
Observable Universe ◽  
Cosmological Principle ◽  
Riemannian Spacetime ◽  
The Universe ◽  
Copernican Principle

This chapter provides a few examples of representations of the universe on a large scale—a first step in constructing a cosmological model. It first discusses the Copernican principle, which is an approximation/hypothesis about the matter distribution in the observable universe. The chapter then turns to the cosmological principle—a hypothesis about the geometry of the Riemannian spacetime representing the universe, which is assumed to be foliated by 3-spaces labeled by a cosmic time t which are homogeneous and isotropic, that is, ‘maximally symmetric’. After a discussion on maximally symmetric space, this chapter considers spacetimes with homogenous and isotropic sections. Finally, this chapter discusses Milne and de Sitter spacetimes.

scholarly journals Mixed fluid cosmological model in f(R, T) gravity

2020 ◽  
Vol 98 (11) ◽  
pp. 1015-1022 ◽  
Author(s):  
Parbati Sahoo ◽  
Barkha Taori ◽  
K.L. Mahanta
Keyword(s):  
Cosmological Model ◽  
Bianchi Type ◽  
Type I ◽  
Time Varying ◽  
Eos Parameter ◽  
Barotropic Fluid ◽  
Rotationally Symmetric ◽  
Expansion Of The Universe ◽  
The Universe ◽  
Mixed Fluid

We construct a locally rotationally symmetric (LRS) Bianchi type-I cosmological model in f(R, T) theory of gravity when the source of gravitation is a mixture of barotropic fluid and dark energy (DE) by employing a time-varying deceleration parameter. We observe through the behavior of the state finder parameters (r, s) that our model begins from the Einstein static era and goes to ΛCDM era. The equation of state (EOS) parameter (ωd) for DE varies from the phantom (ω < –1) phase to quintessence (ω > –1) phase, which is consistent with observational results. It is found that the discussed model can reproduce the current accelerating phase of the expansion of the universe.

An anisotropic cosmological model in Brans-Dicke theory

1983 ◽  
Vol 96 (1) ◽  
pp. 95-105 ◽  
Author(s):  
T. Singh ◽  
L. N. Rai ◽  
Tarkeshwar Singh
Keyword(s):  
Cosmological Model ◽  
Anisotropic Cosmological Model

Erratum: Mixmaster cosmological model in theories of gravity with a quadratic Lagrangian

1990 ◽  
Vol 41 (4) ◽  
pp. 1362-1362 ◽  
Author(s):  
John D. Barrow ◽  
H. Sirousse-Zia
Keyword(s):  
Cosmological Model ◽  
Theories Of Gravity
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