426 citations · 1.9k across the 35 of their papers we have counts for
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Cosmological evolutions in Tsujikawa model of Gravity
Jian-Yong Cen, Shang-Yu Chien, Chao-Qiang Geng +1
We concentrate on the cosmological properties in the Tsujikawa model (TM) of viable gravity with the dynamical background evolution and linear perturbation theory by using t…
Matter Power Spectra in Viable Gravity Models with Dynamical Background
Yow-Chun Chen, Chao-Qiang Geng, Chung-Chi Lee +1
We study the matter power spectra in the viable gravity models with the dynamical background evolution and linear perturbation theory by using the CosmoMC package. We show t…
Observational constraints on successful model of quintessential Inflation
Chao-Qiang Geng, Chung-Chi Lee, M. Sami +2
We study quintessential inflation using a generalized exponential potential , the model admits slow-roll inflation at early times and leads to cl…
Cosmological perturbation and matter power spectrum in bimetric massive gravity
Chao-Qiang Geng, Chung-Chi Lee, Kaituo Zhang
We discuss the linear perturbation equations with the synchronous gauge in a minimal scenario of the bimetric massive gravity theory. We find that the matter density perturbation a…
Deflation of the cosmological constant associated with inflation and dark energy
Chao-Qiang Geng, Chung-Chi Lee
In order to solve the fine-tuning problem of the cosmological constant, we propose a simple model with the vacuum energy non-minimally coupled to the inflaton field. In this model,…
Einstein Static Universe in Exponential Gravity
Jung-Tsung Li, Chung-Chi Lee, Chao-Qiang Geng
We analyze the stability of the Einstein static closed and open universe in two types of exponential gravity theories. We show that the stable solutions exist in these two m…