Cosmological evolutionary model for time-varying deceleration parameter in f(R, T) gravity

2022 ◽  
Author(s):  
R. K. Tiwari ◽  
Fakhereh M. D. Esmaeili
Keyword(s):  
Deceleration Parameter ◽  
Evolutionary Model ◽  
Time Varying

On the convergence of evolution processes with time-varying mutations and local interaction

2001 ◽  
Vol 38 (2) ◽  
pp. 301-323 ◽  
Author(s):  
Hsiao-Chi Chen ◽  
Yunshyoung Chow
Keyword(s):  
Nash Equilibrium ◽  
Dynamic System ◽  
Convergence Rates ◽  
Evolutionary Model ◽  
Coordination Game ◽  
Local Interaction ◽  
Mutation Rates ◽  
Time Varying ◽  
Long Run ◽  
Long Run Equilibrium

This paper analyzes players’ long-run behavior in an evolutionary model with time-varying mutations under both uniform and local interaction rules. It is shown that a risk-dominant Nash equilibrium in a 2 × 2 coordination game would emerge as the long-run equilibrium if and only if mutation rates do not decrease to zero too fast under both interaction methods. The convergence rates of the dynamic system under both interaction rules are also derived. We find that the dynamic system with local matching may not converge faster than that with uniform matching.

Tsallis holographic dark energy in FRW universe with time varying deceleration parameter

New Astronomy ◽  
2019 ◽  
Vol 73 ◽  
pp. 101281 ◽  
Author(s):  
Archana Dixit ◽  
Umesh Kumar Sharma ◽  
Anirudh Pradhan
Keyword(s):  
Dark Energy ◽  
Deceleration Parameter ◽  
Holographic Dark Energy ◽  
Time Varying ◽  
Frw Universe

scholarly journals Bianchi Type-V Bulk Viscous Cosmic String inf(R,T)Gravity with Time Varying Deceleration Parameter

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Bïnaya K. Bishi ◽  
K. L. Mahanta
Keyword(s):  
Deceleration Parameter ◽  
Bianchi Type ◽  
Cosmic Strings ◽  
The Other ◽  
Time Varying ◽  
Constant Deceleration Parameter ◽  
Linearly Varying Deceleration Parameter ◽  
Bulk Viscous ◽  
Type V ◽  
Bianchi Type V

We study the Bianchi type-V string cosmological model with bulk viscosity inf(R,T)theory of gravity by considering a special form and linearly varying deceleration parameter. This is an extension of the earlier work of Naidu et al., 2013, where they have constructed the model by considering a constant deceleration parameter. Here we find that the cosmic strings do not survive in both models. In addition we study some physical and kinematical properties of both models. We observe that in one of our models these properties are identical to the model obtained by Naidu et al., 2013, and in the other model the behavior of these parameters is different.

scholarly journals Bulk Viscous Cosmological Model in Brans-Dicke Theory with New Form of Time Varying Deceleration Parameter

2017 ◽  
Vol 2017 ◽  
pp. 1-24
Author(s):  
G. P. Singh ◽  
Binaya K. Bishi
Keyword(s):  
Equation Of State ◽  
Cosmological Model ◽  
Bulk Viscosity ◽  
Deceleration Parameter ◽  
Chaplygin Gas ◽  
Time Varying ◽  
Modified Chaplygin Gas ◽  
Bulk Viscous ◽  
New Form ◽  
Frw Cosmological Model

We have presented FRW cosmological model in the framework of Brans-Dicke theory. This paper deals with a new proposed form of deceleration parameter and cosmological constant Λ. The effect of bulk viscosity is also studied in the presence of modified Chaplygin gas equation of state (p=Aρ-B/ρn). Furthermore, we have discussed the physical behaviours of the models.

scholarly journals Time Varying Deceleration Parameter in <i>f</i>(<i>R</i>, <i>T</i>) Gravity

2021 ◽  
Vol 09 (05) ◽  
pp. 847-855
Author(s):  
Rishi Kumar Tiwari ◽  
Sushil Kumar Mishra ◽  
Sateesh Kumar Mishra ◽  
Değer Sofuoğlu
Keyword(s):  
Deceleration Parameter ◽  
Time Varying

On the convergence of evolution processes with time-varying mutations and local interaction

2001 ◽  
Vol 38 (02) ◽  
pp. 301-323 ◽  
Author(s):  
Hsiao-Chi Chen ◽  
Yunshyoung Chow
Keyword(s):  
Nash Equilibrium ◽  
Dynamic System ◽  
Convergence Rates ◽  
Evolutionary Model ◽  
Coordination Game ◽  
Local Interaction ◽  
Mutation Rates ◽  
Time Varying ◽  
Long Run ◽  
Long Run Equilibrium

This paper analyzes players’ long-run behavior in an evolutionary model with time-varying mutations under both uniform and local interaction rules. It is shown that a risk-dominant Nash equilibrium in a 2 × 2 coordination game would emerge as the long-run equilibrium if and only if mutation rates do not decrease to zero too fast under both interaction methods. The convergence rates of the dynamic system under both interaction rules are also derived. We find that the dynamic system with local matching may not converge faster than that with uniform matching.

Holographic Dark Energy Model With Time Varying Deceleration Parameter

2018 ◽  
Vol 6 (2) ◽  
pp. 25
Author(s):  
R P. Wankhade
Keyword(s):  
Dark Matter ◽  
Dark Energy ◽  
Deceleration Parameter ◽  
Holographic Dark Energy ◽  
Anisotropy Parameter ◽  
Type I ◽  
Time Varying ◽  
Field Equations ◽  
Large Expansion ◽  
The Universe

Two minimally interacting fluids; dark matter and holographic dark energy components has been studied in a spatially homogeneous and anisotropic Bianchi type-I space-time. The solutions of the Einstein’s field equations are obtained under the assumption of time varying deceleration parameter (Abdussattar and S. Prajapati, Astrophys. Space Sci. 331, 65, 2011) which represents transition of the universe from the early decelerating phase to the recent accelerating phase. It is shown that for large expansion the model reduces to model while for suitable choice of interaction between dark matter and holographic dark energy the anisotropy parameter of the universe approaches to zero for large cosmic time and the coincidence parameter increases with increase in time. Allowing for time dependent deceleration parameter the solutions of the field equations and some physical and geometric properties of the model along with physical acceptability of the solutions have also been discussed in details. 

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