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Alternative quantization of the Hamiltonian in loop quantum cosmology
- Jinsong Yang, You Ding, Yongge Ma
- Physics
- 28 April 2009
FUNDAMENTAL STRUCTURE OF LOOP QUANTUM GRAVITY
- Muxin Han, Weiming Huang, Yongge Ma
- Physics
- 16 September 2005
In the recent twenty years, loop quantum gravity, a background independent approach to unify general relativity and quantum mechanics, has been widely investigated. The aim of loop quantum gravity is…
Five-dimensional Brans-Dicke theory and cosmic acceleration
- Li-e Qiang, Yongge Ma, Muxin Han, Dan Yu
- Physics, Mathematics
- 14 November 2004
We consider a 5-dimensional scalar-tensor theory which is a direct generalization of the original 4-dimensional Brans-Dicke theory to five dimensions. By assuming that there is a…
Loop quantum Brans-Dicke cosmology
- Xiangdong Zhang, Michał Artymowski, Yongge Ma
- Physics
- 18 November 2012
The spatially flat and isotropic cosmological model of Brans-Dicke theory with coupling parameter $\omega\neq-3/2$ is quantized by the approach of loop quantum cosmology. An interesting feature of…
Loop Quantum Brans-Dicke Theory
- Xiangdong Zhang, Yongge Ma
- Physics
- 9 November 2011
The loop quantization of Brans-Dicke theory (with coupling parameter ) is studied. In the geometry-dynamical formalism, the canonical structure and constraint algebra of this theory are similar to…
New length operator for loop quantum gravity
- Yongge Ma, C. Soo, Jinsong Yang
- Physics
- 7 April 2010
An alternative expression for the length operator in loop quantum gravity is presented. The operator is background independent, symmetric, positive semidefinite, and well defined on the kinematical…
Nonperturbative Loop Quantization of Scalar-Tensor Theories of Gravity
- Xiangdong Zhang, Yongge Ma
- Physics
- 26 July 2011
The Hamiltonian formulation of scalar-tensor theories of gravity is derived from their Lagrangian formulation by Hamiltonian analysis. The Hamiltonian formalism marks off two sectors of the theories…
Effective scenario of loop quantum cosmology.
- You Ding, Yongge Ma, Jinsong Yang
- PhysicsPhysical review letters
- 7 August 2008
TLDR
Alternative quantization of the Hamiltonian in isotropic loop quantum cosmology
- Jinsong Yang, You Ding, Yongge Ma
- Physics
- 11 February 2009
Since there are quantization ambiguities in constructing the Hamiltonian constraint operator in isotropic loop quantum cosmology, it is crucial to check whether the key features of loop quantum…
Extension of loop quantum gravity to f(R) theories.
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