Topic
Deceleration parameter
About: Deceleration parameter is a research topic. Over the lifetime, 1776 publications have been published within this topic receiving 89440 citations.
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TL;DR: In this article, the magnetized strange quark matter (MSQM) solutions for a Marder type universe using constant deceleration parameter were obtained for f(R,T) =...
Abstract: The magnetized strange quark matter (MSQM) solutions are obtained for a Marder type universe using constant deceleration parameter. The exact solutions of field equations are obtained for f(R,T) = ...
13 citations
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13 citations
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TL;DR: In this article, the Friedmann-Brans-Dicke cosmology with the cosmological term was analyzed and the scale factor experienced a "bounce" and demonstrated regular behavior at all times.
Abstract: We compare Ya B Zeldovich's ideas about Brans–Dicke theory and Mach's principles, contained in now-classical books, with modern results in this field. Our recent results on the Brans–Dicke cosmology with the cosmological term are presented. The Friedmann–Brans–Dicke equations are written for the flat Universe. The initial conditions for the model are provided by the presently observed Hubble constant, its first time derivative (the deceleration parameter), and matter density. The cosmological scenario with the scale factor not vanishing in the past, corresponding to the absence of the cosmological singularity, is analytically calculated. Instead of the singularity, the scale factor experiences a 'bounce' and demonstrates regular behavior at all times. Some ideas related to Mach's principle are also discussed.
13 citations
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TL;DR: In this article, the authors reported various aspects of modified holographic Ricci dark energy interacting with pressureless dark matter in a flat Friedman-Robertson-Walker universe, and the cosmological parameters, namely, Hubble parameter, equation of state parameter and deceleration parameter have been studied under this interaction.
Abstract: The present paper reports various aspects of modified holographic Ricci dark energy interacting with pressureless dark matter in a flat Friedman-Robertson-Walker universe. The cosmological parameters, namely, Hubble parameter, equation of state parameter and deceleration parameter have been studied under this interaction. Statfinder diagnostics has also been studied, where attainment of $$\Uplambda$$
CDM phase of the universe under this interaction has been observed. A study on fractional densities has prominently shown the transition from matter dominated to dark energy dominated universe.
13 citations
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TL;DR: In this paper, the authors presented and analyzed cosmological models with an anisotropic variable parameter, and constructed two different models with respect to the scale factors, such as power law scale factor and hybrid scale factor.
Abstract: In this article, we present and analyze cosmological models with an anisotropic variable parameter. We have set up the field equations with the space time in the form of Bianchi I metric with an f(R, T) gravity. The functional form for the f(R, T) gravity has been assumed to be $$f(R,T)=R+2f(T)$$
, where R and T are, respectively, the Ricci scalar and trace of the energy–momentum tensor. Two different models are constructed with respect to the scale factors, such as power law scale factor and hybrid scale factor. Moreover, the anisotropic parameter taken here in the form of hyperbolic function further gives clarity on the behavior of equation of state parameter. It is to note that when the values of the coefficient constant vanish, the model yields the isotropic universe. For both the cases, the deceleration parameter, state finder diagnostic pair and energy conditions have been obtained and analyzed which provide physical plausibility of the models.
13 citations