Constraining the dark fluid (2009)
Kunz, Martin, Liddle, Andrew R, Parkinson, David, Gao, Changjun
Cosmological observations are normally fit under the assumption that the dark sector can be decomposed into dark matter and dark energy components. However, as long as the probes remain purely...
Modified gravity in Arnowitt-Deser-Misner formalism (2009)
Motivated by Horava-Lifshitz gravity theory, we propose and investigate a modified gravity theory in the Arnowitt-Deser-Misner (ADM) formalism. The gravitational action includes one ultraviolet term...
What is the fate of a black hole embedded in an expanding universe? (2008)
Faraoni, Valerio, Gao, Changjun, Chen, Xuelei, Shen, You-Gen
Within a large class of exact solutions of the Einstein equations describing a black hole embedded in a Friedmann universe it is shown that, under certain assumptions, only those with comoving...
Does the mass of a black hole decrease due to the accretion of phantom energy (2008)
Gao, Changjun, Chen, Xuelei, Faraoni, Valerio, Shen, You-Gen
According to Babichev et al., the accretion of a phantom test fluid onto a Schwarzschild black hole will induce the mass of the black hole to decrease, however the backreaction was ignored in their...
A Holographic Dark Energy Model from Ricci Scalar Curvature (2007)
Gao, Changjun, Wu, Fengquan, Chen, Xuelei, Shen, You-Gen
Motivated by the holographic principle, it has been suggested that the dark energy density may be inversely proportional to the area of the event horizon of the Universe. However, such a model would...