Zobrazeno 1 - 10
of 1 021
pro vyhledávání: '"Liu, Hongguang"'
A new set of twisted geometric variables is introduced to parametrize the holonomy-flux phase space in loop quantum gravity. It is verified that these new geometric variables, after symplectic reduction with respect to the Gauss constraint, form a Po
Externí odkaz:
http://arxiv.org/abs/2410.09828
We present further applications of the formalism introduced by the authors in arXiv:2308.10949, which allows embedding of a broad class of generalized LTB models into effective spherically symmetric spacetimes. We focus on regular black hole models,
Externí odkaz:
http://arxiv.org/abs/2405.03554
This work develops a comprehensive algorithm and a Mathematica program to construct boundary data and compute real and complex critical points in spinfoam amplitudes. Our approach covers both spacelike tetrahedra and triangles in the EPRL model and t
Externí odkaz:
http://arxiv.org/abs/2404.10563
We study homogenous and isotropic quantum cosmology using the spinfoam formalism of Loop Quantum Gravity (LQG). We define a coupling of a scalar field to the 4-dimensional Lorentzian Engle-Pereira-Rovelli-Livine (EPRL) spinfoam model. We employ the n
Externí odkaz:
http://arxiv.org/abs/2402.07984
Autor:
Long, Gaoping, Liu, Hongguang
In this article we propose a new construction of the spatial scalar curvature operator in (1+3)-dimensional LQG based on the twisted geometry. The starting point of the construction is to express the holonomy of the spin connection on a graph in term
Externí odkaz:
http://arxiv.org/abs/2402.03154
Publikováno v:
Diversity and Distributions, 2024 Feb 01. 30(2), 1-13.
Externí odkaz:
https://www.jstor.org/stable/48755840
Based on modifications inspired from loop quantum gravity (LQG), spherically symmetric models have recently been explored to understand the resolution of classical singularities and the fate of the spacetime beyond. While such phenomenological studie
Externí odkaz:
http://arxiv.org/abs/2308.10953
We generalize the existing works on the way (generalized) LTB models can be embedded into polymerized spherically symmetric models in several aspects. We re-examine such an embedding at the classical level and show that a suitable LTB condition can o
Externí odkaz:
http://arxiv.org/abs/2308.10949
Autor:
Giesel, Kristina, Liu, Hongguang
Publikováno v:
Universe 2023, 9(4), 176
We consider an extended phase space formulation for cosmological and spherically symmetric models in which the choice of a given $\overline{\mu}$-scheme can be implemented dynamically. These models are constructed in the context of the relational for
Externí odkaz:
http://arxiv.org/abs/2303.18111
The complex critical points are analyzed in the 4-dimensional Lorentzian Engle-Pereira-Rovelli-Livine (EPRL) spinfoam model in the large-$j$ regime. For the 4-simplex amplitude, taking into account the complex critical point generalizes the large-$j$
Externí odkaz:
http://arxiv.org/abs/2301.02930