179 citations · 2k across the 114 of their papers we have counts for
5 papers · 1 filter
Constraints on holographic dark energy from X-ray gas mass fraction of galaxy clusters
Zhe Chang, Feng-Quan Wu, Xin Zhang
We use the Chandra measurements of the X-ray gas mass fraction of 26 rich clusters released by Allen et al. to perform constraints on the holographic dark energy model. The constra…
Cosmic ray threshold in an asymptotically dS spacetime
Zhe Chang, Shao-Xia Chen, Cheng-Bo Guan +1
We discuss the threshold anomaly in ultra-high energy cosmic ray physics by assuming that the matter world just be perturbation of a de Sitter universe, which is consistent with th…
Cosmic ray threshold anomaly and kinematics in the dS spacetime
Zhe Chang, Shao-Xia Chen, Cheng-Bo Guan
We present a covariant framework of kinematics in the dS spacetime, which is a natural postulate of recent astronomical observations (. One-particle states are presented expl…
Effects of the Cosmological Constant as the Origin of the Cosmic-Ray Paradox
Zhe Chang, Shao-Xia Chen, Cheng-Bo Guan
We show that a tiny but non-zero positive cosmological constant, which has been strongly suggested by the recent astronomical observations on supernovae and CMBR, may change notabl…
Matching the observed cosmological constant with vacuum energy density in AdS
Zhe Chang, Xin-Bing Huang
We calculate the vacuum energy density by taking account of different massive scalar fields in AdS spacetime. It is found that the mass spectrum of a scalar field in AdS spacetime…