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10 papers · 2 filters
Thermodynamics in Loop Quantum Cosmology
Li-Fang Li, Jian-Yang Zhu
Loop quantum cosmology (LQC) is very powerful to deal with the behavior of early universe. And the effective loop quantum cosmology gives a successful description of the universe i…
Averaged null energy condition in Loop Quantum Cosmology
Li-Fang Li, Jian-Yang Zhu
Wormhole and time machine are very interesting objects in general relativity. However, they need exotic matters which are impossible in classical level to support them. But if we i…
Critical comments on the paper "Crossing by a single scalar field on a Dvali-Gabadadze-Porrati brane" by H Zhang and Z-H Zhu [Phys.Rev.D75,023510(2007)]
Israel Quiros, Ricardo Garcia-Salcedo, Claudia Moreno
It is demonstrated that the claim in the paper "Crossing by a single scalar field on a Dvali-Gabadadze-Porrati brane" by H Zhang and Z-H Zhu [Phys.Rev.D75,023510(2007)], abo…
Quasi-Local Energy in Loop Quantum Gravity
Jinsong Yang, Yongge Ma
Although there is no known meaningful notion of the energy density of the gravitational field in general relativity, a few notions of quasi-local energy of gravity associated to ex…
Tachyon field in loop quantum cosmology: An example of traversable singularity
Li-Fang Li, Jian-Yang Zhu
Loop quantum cosmology (LQC) predicts a nonsingular evolution of the universe through a bounce in the high energy region. But LQC has an ambiguity about the quantization scheme. Re…
Dynamical Evolution of Interacting Modified Chaplygin Gas
Song Li, Yongge Ma, Yun Chen
The cosmological model of the modified Chaplygin gas interacting with cold dark matter is studied. Our attention is focused on the final state of universe in the model. It turns ou…