Cosmology

General Relativity

Modified Gravity

We proposed a holographic dark energy model from Ricci scalar. We find the model does not only avoid the causality problem and is phonologically viable, but also naturally solves the coincidence problem of dark energy.

We obtained the dilaton black-hole solutions in the background of the de Sitter or anti–de Sitter
universe, with the combination of three Liouville-type dilaton potentials.

Black holes in the Universe: Generalized Lema？tre-Tolman-Bondi solutions,Changjun Gao, Xuelei Chen, You-Gen Shen, and Valerio Faraoni,Phys. Rev. D 84, 104047(2011)
Holographic dark energy model from Ricci scalar curvature,Changjun Gao, Fengquan Wu, Xuelei Chen, and You-Gen Shen,Phys. Rev. D 79, 043511(2009)
Does the mass of a black hole decrease due to the accretion of phantom energy? Changjun Gao, Xuelei Chen, Valerio Faraoni, and You-Gen Shen, Phys. Rev. D 78, 024008(2008)
Higher-dimensional dilaton black holes with cosmological constant, Chang Jun Gao and Shuang Nan Zhang, Physics Letters B605,185(2005)
Reissner–Nordstr？m metric in the Friedman–Robertson–Walker universe, Chang Jun Gao and Shuang Nan Zhang, Physics Letters B595,28(2004)
Dilaton black holes in the de Sitter or anti–de Sitter universe, Chang Jun Gao and Shuang Nan Zhang, Phys. Rev. D70, 124019(2004)