Viscous cosmology in holographic dark energy with Granda–Oliveros cut-off

作     者：Simran Kaur C P Singh Simran Kaur;C P Singh

作者机构：Department of Applied MathematicsDelhi Technological UniversityBawana RoadDelhi-110042India 

出 版 物：《Communications in Theoretical Physics》 (理论物理通讯（英文版）)

年 卷 期：2023年第75卷第2期

页      面：144-156页

核心收录：

学科分类：07[理学] 070401[理学-天体物理] 0704[理学-天文学] 

基　　金：SRF(Senior Research Fellowship)from the Council of Scientific and Industrial Research New Delhi India 

主　　题：viscosity holographic dark energy cosmology 

摘      要：We study the effect of bulk viscosity on holographic dark energy(HDE)with Granda–Oliveros infra-red *** focus on a generalized form of the bulk viscous coefficient which successfully describes the present-day evolution of the *** observe that the model with bulk viscosity provides an elegant description of the early and late-time evolution of the *** constrain the model through the combined observational data of the Strong Lensing System(SLS),measurements of Hubble parameter,Type Ia supernova data of Pantheon sample and local H_(0)measured by *** best-fit values obtained from two different combinations of data,we estimate the present value of Hubble’s constant H_(0)=71.567-0.848+1.448and H_(0)=69.197-1.924+1.563,the deceleration parameter q_(0)=-0.535-0.016+0.016and q_(0)=-0.536-0.016+0.016,and the equation of state w_(0)=-0.690-0.010+0.010and w_(0)=-0.691-0.011+0.011,*** HDE model with bulk viscosity exhibits the phase transition from decelerated epoch to accelerated epoch.A comparison of the model with the standardΛCDM model is discussed with the statefinder and cosmographic parameters.