181 citations · 823 across the 26 of their papers we have counts for
26 papers
Covariant effective spacetimes of spherically symmetric electrovacuum with a cosmological constant
Jinsong Yang, Cong Zhang, Yongge Ma
An algebraic framework was introduced in our previous works to address the covariance issue in spherically symmetric effective quantum gravity. This paper extends the framework to…
Black holes and covariance in effective quantum gravity: A solution without Cauchy horizons
Cong Zhang, Jerzy Lewandowski, Yongge Ma +1
The issue of general covariance in effective quantum gravity models within the Hamiltonian framework is addressed. The previously proposed equations for the covariance condition in…
Shadows of rotating black holes in effective quantum gravity
Zhenglong Ban, Jiawei Chen, Jinsong Yang
Recently, two new spherically symmetric black hole models with covariance have been proposed in effective quantum gravity. Based on these models, we use the modified Newman-Janis a…
Black Holes and Covariance in Effective Quantum Gravity
Cong Zhang, Jerzy Lewandowski, Yongge Ma +1
The longstanding issue of general covariance in effective models of quantum gravity is addressed, which arises when canonical quantum gravity leads to a semiclassical model describ…
Entanglement entropy of coherent intertwiner in loop quantum gravity
Gaoping Long, Qian Chen, Jinsong Yang
In this paper, we carry out the entanglement calculations on the coherent intertwiners. We first consider the entanglement introduced by the group-averaging of the tensor-product t…
Graphical calculus of spin networks
Emanuele Alesci, Ilkka Mäkinen, Jinsong Yang
Graphical techniques provide a very useful practical device for calculations involving the so-called spin network states, which encode the quantum degrees of freedom of spatial geo…
Black hole image encoding quantum gravity information
Cong Zhang, Yongge Ma, Jinsong Yang
The quantum extension of the Kruskal spacetime indicates the existence of a companion black hole in the universe earlier than ours. It is shown that the radiations from the compani…
Alternative loop quantum cosmology
Jinsong Yang, Cong Zhang, Xiangdong Zhang
An alternative quantization of the gravitational Hamiltonian constraint of the Friedmann-Robertson-Walker model is proposed by treating the Euclidean term and the Lorentzian…
Shadow and stability of quantum-corrected black holes
Jinsong Yang, Cong Zhang, Yongge Ma
Recently the quantum Oppenheimer-Snyder gravitational collapse model has been proposed in loop quantum gravity, providing quantum-corrected Schwarzschild spacetimes as the exterior…
Quantum Oppenheimer-Snyder and Swiss Cheese models
Jerzy Lewandowski, Yongge Ma, Jinsong Yang +1
By considering the quantum Oppenheimer-Snyder model in loop quantum cosmology, a new quantum black hole model whose metric tensor is a suitably deformed Schwarzschild one is derive…
Relating spin-foam to canonical loop quantum gravity by graphical calculus
Jinsong Yang, Cong Zhang, Yongge Ma
The graphical calculus method is generalized to study the relation between covariant and canonical dynamics of loop quantum gravity. On one hand, a graphical derivation of the part…
Loop quantum cosmology from an alternative Hamiltonian. II. Including the Lorentzian term
Jinsong Yang, Cong Zhang, Yongge Ma
The scheme of using the Chern-Simons action to regularize the gravitational Hamiltonian constraint is extended to including the Lorentzian term in the cosmological model. The…
Canonical loop quantization of the lowest-order projectable Horava gravity
Xiangdong Zhang, Jinsong Yang, Yongge Ma
The Hamiltonian formulation of the lowest-order projectable Horava gravity, namely the so-called - gravity, is studied. Since a preferred foliation has been chosen in project…
Consistency check on the fundamental and alternative flux operators in loop quantum gravity
Jinsong Yang, Yongge Ma
There are different constructions of the flux of triad in loop quantum gravity, namely the fundamental and alternative flux operators. In parallel to the consistency check on the t…
Light bending and gravitational lensing in Brans-Dicke theory
Xiaojun Gao, Shupeng Song, Jinsong Yang
As an important candidate theory of gravity, Brans-Dicke theory has been widely studied. In this paper, we investigate light bending and gravitational lensing by compact objects in…
Loop quantum cosmology from an alternative Hamiltonian
Jinsong Yang, Cong Zhang, Yongge Ma
In this paper, a new Hamiltonian constraint operator for loop quantum cosmology is constructed by using the Chern-Simons action. The quantum dynamics of the cosmological mode…
New volume and inverse volume operators for loop quantum gravity
Jinsong Yang, Yongge Ma
A new alternative volume operator is constructed for loop quantum gravity by using the so-called cotriad operators as building blocks. It is shown that the new volume operator shar…
New Hamiltonian constraint operator for loop quantum gravity
Jinsong Yang, Yongge Ma
A new symmetric Hamiltonian constraint operator is proposed for loop quantum gravity, which is well defined in the Hilbert space of diffeomorphism invariant states up to non-planar…
Graphical method in loop quantum gravity: II. The Hamiltonian constraint and inverse volume operators
Jinsong Yang, Yongge Ma
This is the second paper in the series to introduce a graphical method to loop quantum gravity. We employ the graphical method as a powerful tool to calculate the actions of the Eu…
Graphical method in loop quantum gravity: I. Derivation of the closed formula for the matrix element of the volume operator
Jinsong Yang, Yongge Ma
To adopt a practical method to calculate the action of geometrical operators on quantum states is a crucial task in loop quantum gravity. In the series of papers, we will introduce…
New formulation of Horava-Lifshitz quantum gravity as a master constraint theory
Chopin Soo, Jinsong Yang, Hoi-Lai Yu
Both projectable and non-projectable versions of Horava-Lifshitz gravity face serious challenges. In the non-projectable version, the constraint algebra is seemingly inconsistent.…
New length operator for loop quantum gravity
Yongge Ma, Chopin Soo, Jinsong Yang
An alternative expression for the length operator in loop quantum gravity is presented. The operator is background independent, symmetric, positive semidefinite, and well defined o…
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…
Alternative quantization of the Hamiltonian in isotropic loop quantum cosmology
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…