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Current cosmological constraints on the curvature, dark energy and modified gravity
Yungui Gong, Xiao-ming Zhu, Zong-Hong Zhu
We apply the Union2 compilation of 557 supernova Ia data, the baryon acoustic oscillation measurement of distance, the cosmic microwave background radiation data from the seven yea…
Constraining the interacting dark energy models from weak gravity conjecture and recent observations
Ximing Chen, Bin Wang, Nana Pan +1
We examine the effectiveness of the weak gravity conjecture in constraining the dark energy by comparing with observations. For general dark energy models with plausible phenomenol…
Improved cosmological constraints on the curvature and equation of state of dark energy
Nana Pan, Yungui Gong, Yun Chen +1
We apply the Constitution compilation of 397 supernova Ia, the baryon acoustic oscillation measurements including the parameter, the distance ratio and the radial data, the fiv…
Constraints on growth index parameters from current and future observations
Jason Dossett, Mustapha Ishak, Jacob Moldenhauer +2
We use current and future simulated data of the growth rate of large scale structure in combination with data from supernova, BAO, and CMB surface measurements, in order to put con…
Modified gravity emerging from thermodynamics and holographic principle
Yi Zhang, Yun-gui Gong, Zong-Hong Zhu
A new conception is proposed in Ref.\cite{Verlinde:2010hp,Padmanabhan:2009kr} that gravity is one kind of entropic force. In this letter, we try to discuss its applications to the…
Equipartition of energy and the first law of thermodynamics at the apparent horizon
Fu-Wen Shu, Yungui Gong
We apply the holographic principle and the equipartition law of energy to the apparent horizon of a Friedmann-Robertson-Walker universe and derive the Friedmann equation describing…
Using a phenomenological model to test the coincidence problem of dark energy
Yun Chen, Zong-Hong Zhu, J. S. Alcaniz +1
By assuming a phenomenological form for the ratio of the DE and DM densities (Dalal et al.2001), we discuss the cosmic coincidence problem in light of curren…
Probing the cosmic acceleration from combinations of different data sets
Yungui Gong, Bin Wang, Rong-gen Cai
We examine in some detail the influence of the systematics in different data sets including type Ia supernova sample, baryon acoustic oscillation data and the cosmic microwave back…