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8 papers · 2 filters
Loop quantum modified gravity and its cosmological application
Xiangdong Zhang, Yongge Ma
A general nonperturvative loop quantization procedure for metric modified gravity is reviewed. As an example, this procedure is applied to scalar-tensor theories of gravity. The qu…
Loop quantum Brans-Dicke cosmology
Xiangdong Zhang, Michal Artymowski, Yongge Ma
The spatially flat and isotropic cosmological model of Brans-Dicke theory with coupling parameter is quantized by the approach of loop quantum cosmology. An interesting…
Destroying extremal Kerr-Newman black holes with test particles
Sijie Gao, Yuan Zhang
It has been shown that a nearly extremal black hole can be overcharged or overspun by a test particle if radiative and self-force effects are neglected, indicating that the cosmic…
Anomaly freedom of the vector modes with holonomy corrections in perturbative Euclidean loop quantum gravity
Jian-Pin Wu, Yongge Ma
We study the perturbation of the effective Hamiltonian constraint with holonomy correction from Euclidean loop quantum gravity. The Poisson bracket between the corrected Hamiltonia…
Coherent State Functional Integral in Loop Quantum Cosmology: Alternative Dynamics
Li Qin, Yongge Ma
Coherent state functional integral for the minisuperspace model of loop quantum cosmology is studied. By the well-established canonical theory, the transition amplitude in the path…
Spectroscopy of a Reissner-Nordström black hole via an action variable
Xiao-Xiong Zeng, Wen-Biao Liu
With the help of the Bohr--Sommerfeld quantization rule, the area spectrum of a charged, spherically symmetric spacetime is obtained by studying an adiabatic invariant action varia…