Observational constraints on running vacuum model

作     者：Jin-Jun Zhang Chung-Chi Lee Chao-Qiang Geng 张进军;Chung-Chi Lee;耿朝强

作者机构：School of Physics and Information Engineering Shanxi Normal University DAMTP Centre for Mathematical Sciences University of Cambridge Department of Physics National Tsing Hua University National Center for Theoretical Sciences 

出 版 物：《Chinese Physics C》 (中国物理C（英文版）)

年 卷 期：2019年第43卷第2期

页      面：132-137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：Supported by National Center for Theoretical Sciences,MoST(MoST-104-2112-M-007-003-MY3,MoST-107-2119-M-007-013-MY3 and MoST-106-2917-I-564-055) the Newton International Fellowship(NF160058)from the Royal Society(UK) 

主　　题：matter power spectrum running vacuum model CMB temperature spectrum cosmological constant 

摘      要：We investigate the power spectra of the CMB temperature and matter density in the running vacuum model(RVM) with the time-dependent cosmological constant of A=3 vH^2+ Λ_0, where H is the Hubble parameter. In this model, dark energy decreases in time and decays to both matter and radiation. By using the Markov chain Monte Carlo method, we constrain the model parameter v as well as the cosmological observables. Explicitly, we obtain v ≤1.54× 10^(-4)(68% confidence level) in the RVM with the best-fit χ_(RVM)~2 =13968.8, which is slightly smaller thanχ_(ΛCDM)~2= 13969.8 in the ΛCDM model of v = 0.