426 citations · 1.9k across the 35 of their papers we have counts for
5 papers · 1 filter
Equation of state for dark energy in gravity
Kazuharu Bamba, Chao-Qiang Geng, Chung-Chi Lee +1
We study the cosmological evolutions of the equation of state for dark energy in the exponential and logarithmic as well as their combination theories. We…
Observational Constraints on Exponential Gravity
Louis Yang, Chung-Chi Lee, Ling-Wei Luo +1
We study the observational constraints on the exponential gravity model of f(R)=-beta*Rs(1-e^(-R/Rs)). We use the latest observational data including Supernova Cosmology Project (S…
Comment on "Einstein's Other Gravity and the Acceleration of the Universe''
Kazuharu Bamba, Chao-Qiang Geng, Chung-Chi Lee
We show that in the exponential model studied by E. Linder [arXiv:1005.3039, Phys.Rev.D 81, 127301 (2010)], it is impossible to have the crossing of the phantom divide line…
Generic feature of future crossing of phantom divide in viable gravity models
Kazuharu Bamba, Chao-Qiang Geng, Chung-Chi Lee
We study the equation of state for dark energy and explicitly demonstrate that the future crossings of the phantom divide line are the generic feature in the e…
Cosmological evolution in exponential gravity
Kazuharu Bamba, Chao-Qiang Geng, Chung-Chi Lee
We explore the cosmological evolution in the exponential gravity (). We summarize various viability conditions and expli…