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11 papers · 2 filters
Five-dimensional metric gravity and the accelerated universe
Biao Huang, Song Li, Yongge Ma
The metric theories of gravity are generalized to five-dimensional spacetimes. By assuming a hypersurface-orthogonal Killing vector field representing the compact fifth dime…
New Geometry with All Killing Vectors Spanning the Poincaré Algebra
Chao-Guang Huang, Yu Tian, Xiao-Ning Wu +2
The new 4D geometry whose Killing vectors span the Poincaré algebra is presented and its structure is analyzed. The new geometry can be regarded as the Poincaré-invariant solution…
Emergence of scalar matter from spinfoam model
Peng Xu, Yongge Ma
A spinfoam model of 3D gravity non-minimally coupled with a scalar field is studied. By discretization of the scalar field, the model is worked out precisely in a purely combinatio…
Loop quantum cosmology with higher order holonomy corrections
Dah-Wei Chiou, Li-Fang Li
With a well-motivated extension of higher order holonomy corrections, the quantum theory of loop quantum cosmology (LQC) for the Friedmann-Robertson-Walker model (with a free…
Alternative quantization of the Hamiltonian in loop quantum cosmology II: Including the Lorentz term
Jinsong Yang, You Ding, Yongge Ma
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…
On Newman-Penrose constants of stationary electrovacuum spacetimes
Xiangdong Zhang, Xiaoning Wu, Sijie Gao
A theorem related to the Newman-Penrose constants is proven. The theorem states that all the Newman-Penrose constants of asymptotically flat, stationary, asymptotically algebraical…