Showing papers by "Rong-Gen Cai published in 2002"
TL;DR: In this article, the authors considered a model with multitachyon fields and study the assisted inflationary solution and showed that this model satisfies the observations, and proposed a multichyclic model with a single tachyon field.
Abstract: The model of inflation with a single tachyon field generates larger anisotropy and has difficulties in describing the formation of the Universe [L. Kofman and A. Linde, J. High Energy Phys. 07, 004 (2002)]. In this paper we consider a model with multitachyon fields and study the assisted inflationary solution. Our results show that this model satisfies the observations.
204 citations
TL;DR: In this article, it was shown that the entropy of cosmological horizon in the Schwarzschild-de Sitter solution and topological de Sitter solutions can be expressed in a form of the Cardy-Verlinde formula, if one adopts the prescription to compute the gravitational mass from data at early or late time infinity of do Sitter space.
174 citations
TL;DR: In this paper, the authors discuss the question of whether the entropy of cosmological horizon in some asymptotically de Sitter spaces can be described by the Cardy-Verlinde formula.
132 citations
TL;DR: In this article, the authors present two solutions of the mass bound conjecture, one is the topological de Sitter solution and the other is its dilatonic deformation, and they show that the thermodynamic quantities associated with the cosmological horizon of the two solutions obey the first law of thermodynamics.
Abstract: Recently an interesting conjecture was put forward which states that any asymptotically de Sitter space whose mass exceeds that of exact de Sitter space contains a cosmological singularity. In order to test this mass bound conjecture, we present two solutions. One is the topological de Sitter solution and the other is its dilatonic deformation. Although the latter is not an asymptotically de Sitter space, the two solutions have a cosmological horizon and a cosmological singularity. Using the surface counterterm method we compute the quasilocal stress-energy tensor of a gravitational field and the mass of the two solutions. It turns out that this conjecture holds within the two examples. Also we show that the thermodynamic quantities associated with the cosmological horizon of the two solutions obey the first law of thermodynamics. Furthermore, the nonconformal extension of dS/CFT correspondence is discussed.
99 citations
TL;DR: In this paper, the authors considered a five-dimensional constant curvature black hole, which is constructed by identifying some points along a Killing vector in a fivedimensional AdS space and found that the trace of the tensor does indeed vanish, as expected.
66 citations
TL;DR: In this paper, the authors considered a five-dimensional constant curvature black hole, which is constructed by identifying some points along a Killing vector in a fivedimensional AdS space and found that the trace of the tensor does indeed vanish, as expected.
Abstract: We consider a five-dimensional constant curvature black hole, which is constructed by identifying some points along a Killing vector in a five-dimensional AdS space. The black hole has the topology M_4 times S^1, its exterior is time-dependent and its boundary metric is of the form of a three-dimensional de Sitter space times a circle, which means that the dual conformal field theory resides on a dynamical spacetime. We calculate the quasilocal stress-energy tensor of the gravitational background and then the stress-energy tenor of the dual conformal field theory. It is found that the trace of the tensor does indeed vanish, as expected. Further we find that the constant curvature black hole spacetime is just the "bubble of nothing" resulting from Schwarzschild-AdS black holes when the mass parameter of the latter vanishes.
11 citations
TL;DR: In this article, the effect of the 4D effective cosmological constant on the stability of the brane system was studied, and it was shown that the proper distance between the two branes required to solve the hierarchy problem can exist.
Abstract: We study the Randall-Sundrum model with a small 4D effective cosmological constant on the brane, and drive a corrected radion potential following the Goldberger-Wise mechanism. We then discuss the effect of the 4D effective cosmological constant on the stability of the brane-system, and find that to quintessence determined by updated observation, the proper distance between the two branes required to solve the hierarchy problem can exist. However, during inflation, whether we can get a reasonable hierarchy scale is still uncertain.
1 citations
TL;DR: In this paper, the effect of the 4D effective cosmological constant on the stability of the brane system was studied, and it was shown that the proper distance between the two branes required to solve the hierarchy problem can exist.
Abstract: We study the Randall-Sundrum model with a small 4D effective cosmological constant on the brane, and drive a corrected radion potential following the Goldberger-Wise mechanism. We then discuss the effect of the 4D effective cosmological constant on the stability of the brane-system, and find that to quintessence determined by updated observation, the proper distance between the two branes required to solve the hierarchy problem can exist. However, during inflation, whether we can get an reasonable hierarchy scale is still uncertain.