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On the Stability of Cosmological Models
General Relativity and Gravitation, 1997Reprint of \textit{N. R. Sen} [Z. Astrophys. 9, 215-224 (1934; Zbl 0010.28302)], with a foreword by Andrzej Krasiński and a biography of N. R. Sen by A. K. Raychaudhuri.
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Cosmological models with a variable cosmological term and bulk viscous models
Physical Review D, 1993Recently, flat variable-Λ cosmological models have been discussed by Berman. It is shown that these models are equivalent to perfect fluid models with bulk viscosity which have been presented previously. The model of Berman, which is free of particle creation and which is claimed to solve the entropy problem, is shown to be the usual Einstein-de Sitter
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Cosmological models with variable gravitational and cosmological ?constants?
General Relativity and Gravitation, 1991zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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Nature, 1966
(I) IT is familiar that the Einstein equations for the density and pressure in a uniform universe: do not suffice to specify the model since there are two equations and three unknown functions, ρ, p and R.
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(I) IT is familiar that the Einstein equations for the density and pressure in a uniform universe: do not suffice to specify the model since there are two equations and three unknown functions, ρ, p and R.
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2020
This chapter examines two spatially homogenous world pictures which captured most of the attention in cosmology from the late 1940s through the mid-1960s: an evolving universe and a universe in a statistically steady state. The evolving model describes expansion according to general relativity from an exceedingly dense early condition often termed the ...
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This chapter examines two spatially homogenous world pictures which captured most of the attention in cosmology from the late 1940s through the mid-1960s: an evolving universe and a universe in a statistically steady state. The evolving model describes expansion according to general relativity from an exceedingly dense early condition often termed the ...
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Observational cosmology and cosmological models
Soviet Physics Uspekhi, 1987N.S. Kardashev +2 more
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Cosmological models with a variable cosmological term
Physical Review D, 1991openaire +2 more sources
1992
Before the observational evidence is presented in detail it seems convenient to establish a few theoretical concepts. The basic motivation is to describe the expansion of the universe in as simple terms as possible. In this restricted sense the classical term “cosmological model” usually means a geometrical description of the space-time structure and ...
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Before the observational evidence is presented in detail it seems convenient to establish a few theoretical concepts. The basic motivation is to describe the expansion of the universe in as simple terms as possible. In this restricted sense the classical term “cosmological model” usually means a geometrical description of the space-time structure and ...
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Revisiting the cosmological constraints on the interacting dark energy models
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2010exaly
Cosmological Models with Variable Cosmological and Gravitational “Constants” and Bulk Viscous Models
General Relativity and Gravitation, 1997Arbab Arbab
exaly