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20 papers · 2 filters
Shear Viscosity from Effective Couplings of Gravitons
Rong-Gen Cai, Zhang-Yu Nie, Ya-Wen Sun
We calculate the shear viscosity of field theories with gravity duals using Kubo-formula by calculating the Green function of dual transverse gravitons and confirm that the value o…
Gravitational Radiation by Cosmic Strings in a Junction
Robert Brandenberger, Hassan Firouzjahi, Johanna Karouby +1
The formalism for computing the gravitational power radiation from excitations on cosmic strings forming a junction is presented and applied to the simple case of co-planar strings…
Generalized Vaidya Spacetime in Lovelock Gravity and Thermodynamics on Apparent Horizon
Rong-Gen Cai, Li-Ming Cao, Ya-Peng Hu +1
We present a kind of generalized Vaidya solutions in a generic Lovelock gravity. This solution generalizes the simple case in Gauss-Bonnet gravity reported recently by some authors…
N-flation from multiple DBI type actions
Yi-Fu Cai, Wei Xue
In this letter we present a new N-flation model constructed by making use of multiple scalar fields which are being described by their own DBI action. We show that the dependence o…
From the Complete Yang Model to Snyder's Model, de Sitter Special Relativity and Their Duality
Hong-Tu Wu, Chao-Guang Huang, Han-Ying Guo
By means of Dirac procedure, we re-examine Yang's quantized space-time model, its relation to Snyder's model, the de Sitter special relativity and their UV-IR duality. Starting fro…
Hawking Radiation of Apparent Horizon in a FRW Universe
Rong-Gen Cai, Li-Ming Cao, Ya-Peng Hu
Hawking radiation is an important quantum phenomenon of black hole, which is closely related to the existence of event horizon of black hole. The cosmological event horizon of de S…