[PDF] Top 20 The isotropic singularity in cosmological models
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The isotropic singularity in cosmological models
... Definition 10.4.1 Alternative definition of ASPH If a space-time M, g is a C 3 solution of the EFE with imperfect fluid source, and the unit timelike fluid congruence u is both regular a[r] ... See full document
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Perfect quantum cosmological bounce
... bang singularity. For homo- geneous, isotropic backgrounds, and for anisotropic flat backgrounds, we computed the Feynman propagator exactly, showing its large j a j behavior to be insensitive to the ... See full document
6
The big bang's 'beginning of time' and the singular FLRW cosmological models
... Friedmann models (Geroch ...and isotropic universe and a stress-energy tensor of matter corresponding to the simplifying assumption of a distribution of dust with a uniform density ... See full document
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Integrable cosmological models with non-minimal coupling and bounce solutions
... inationary models with a minimally coupled scalar eld lead to suciently large values of the tensor-to-scalar ratio of the density perturbations r , and therefore, are ruled out by the Planck ...the ... See full document
9
Cosmological Models in f(R,T) Theory of Gravitation
... tilted cosmological models in f R T ( , ) theory of gravitation without taking any relation between density and pressure p ...a singularity in the model at t c 1 This singularity is ... See full document
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Volumetric expansions of accelerating unstable cosmological models with a quadratic form of equation of state
... gravity models Nojiri and Odintsov (Nojiri and Odintsov) shows that the unification of early-time inflation and late- time ...) cosmological model Capozziello et ...type-III cosmological ... See full document
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Bianchi Type V Cosmological Models for Perfect Fluid with Time Varying Gravitational and Cosmological Constant
... fluid cosmological models which contain both viscosity and heat ...mological models in the presence of perfect fluid with heat ...type-V cosmological models and ob- tained solutions of ... See full document
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Anisotropic Universe Models with Positive Cosmological Constant
... relation between the two scale factors x and y for the two models. While for Bianchi type-I model we have x = y for the present restrictions. So, we see that for the KS model, the scale factor a(t) starts from ... See full document
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Bulk Viscous Anisotropic Cosmological Models with Dynamical Cosmological Parameters G and ∧
... anisotropic models of the universe, filled with a bulk viscous cosmic fluid, in the presence of variable gravitational and cosmological ...and cosmological constants have been ...of ... See full document
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Criteria for resolving the cosmological singularity in Infinite Derivative Gravity around expanding backgrounds
... which we call an (A)dS-Bianchi I metric. Examples of anisotropic universes are given in Fig. 1. As discussed earlier, the observable universe appears to be highly isotropic [56] but this may not be the case at ... See full document
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Cosmological Models of the Universe
... and isotropic, and is now known to be in a state of accelerated expansion at the Hubble ...certain cosmological factors like curvature k, scale factor a (t) and radius of ... See full document
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How an Effective “Cosmological Constant” May Affect a Minimum Scale Factor, to Avoid a Cosmological Singularity (Breakdown of the First Singularity Theorem)
... different models of contributing vacuum energy, initially may affect divergence from the first singularity ...tive cosmological constant will affect if we have a four dimensional universe in terms of ... See full document
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Analysis of the elastic and inelastic behaviour of healthy and diseased arterial tissue
... While an isotropic hyperelastic characterisation has its limitations, most notably the response of atherosclerotic plaques is not isotropic Holzapfel et ah, 2004, these models are common[r] ... See full document
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A Cosmological Model without Singularity Based on RW Metric (1)
... As is now well known, there is space-time singularity under certain conditions [1]. “These conditions fall into three categories. First, there is the requirement that gravity shall be attractive. Secondly, there ... See full document
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Friedman-like cosmological models with non-zero pressure.
... Broken or indistinct print, colored or poor quality illustrations and.. photographs, print bleed-through, substandard margins, and im proper.[r] ... See full document
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The Corner Singularity of Composite Bars in Torsion
... It is well known that accurate numerical modelling depends upon a firm knowledge of the order of the singularities [3], as the numerical solution is globally affected by singularities. The direct approach of the local ... See full document
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A comparative study of continuum and structural modelling approaches to simulate bone adaptation in the pelvic construct
... is isotropic it is unexpected that those models which include directionality either through the use of structural elements or material directionality all compare more favourably with the CT derived model ... See full document
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Bulk Viscous Anisotropic Cosmological Models with Generalized Chaplygin Gas with Time Varying Gravitational and Cosmological Constants
... Abstract This paper is devoted to studying the generalized Chaplygin gas models in Bianchi type III spacetime geometry with time varying bulk viscosity, cosmological and gravitational co[r] ... See full document
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Cosmological Models in Lyra Geometry with Linearly Varying Deceleration Parameter
... Later Lyra [2] came up with a variation of Riemannian geometry. Lyra’s geometry may also be considered as a modification of Weyl’s geometry. Lyra introduced a gauge function into the structureless manifold. This led to ... See full document
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