Results 1 to 10 of about 84,113 (242)
Living Reviews in Relativity, 2008 The problem of describing the quantum behavior of gravity, and thus understanding quantum spacetime, is still open. Loop quantum gravity is a well-developed approach to this problem. It is a mathematically well-defined background-independent quantization
Rovelli Carlo
doaj +4 more sources
Testing the Master Constraint Programme for Loop Quantum Gravity V. Interacting Field Theories [PDF]
, 2004 This is the final fifth paper in our series of five in which we test the Master Constraint Programme for solving the Hamiltonian constraint in Loop Quantum Gravity.
Ashtekar A +43 more
core +3 more sources
Relativistic Planck-scale polymer
Physics Letters B, 2017 Polymer quantum mechanics has been studied as a simplified picture that reflects some of the key properties of Loop Quantum Gravity; however, while the fate of relativistic symmetries in Loop Quantum Gravity is still not established, it is usually ...
Giovanni Amelino-Camelia +3 more
doaj +4 more sources
Extended Loop Quantum Gravity [PDF]
, 2010 We discuss constraint structure of extended theories of gravitation (also known as f(R) theories) in the vacuum selfdual formulation introduced in ref.
Bojowald M +10 more
core +11 more sources
Perturbatively exact w 1+∞ asymptotic symmetry of quantum self-dual gravity
Journal of High Energy Physics, 2022 The infinite tower of positive-helicity soft gravitons in any minimally coupled, tree-level, asymptotically flat four-dimensional (4D) gravity was recently shown to generate a w 1+∞ asymptotic symmetry algebra. It is natural to ask whether this classical
Adam Ball +3 more
doaj +1 more source
Does the Loop Quantum μo Scheme Permit Black Hole Formation?
Universe, 2021 We explore the way different loop quantization prescriptions affect the formation of trapped surfaces in the gravitational collapse of a homogeneous dust cloud, with particular emphasis on the so-called μo scheme in which loop quantum cosmology was ...
Bao-Fei Li, Parampreet Singh
doaj +1 more source
Loop Quantum Black Hole Extensions Within the Improved Dynamics
Frontiers in Astronomy and Space Sciences, 2021 We continue our investigation of an improved quantization scheme for spherically symmetric loop quantum gravity. We find that in the region where the black hole singularity appears in the classical theory, the quantum theory contains semi-classical ...
Rodolfo Gambini +2 more
doaj +1 more source
Realization of Dirac quantization in loop quantum gravity
Physics Letters B, 2023 The system of gravity coupled to the non-rotational dust field is studied at both classical and quantum levels. The scalar constraint of the system can be written in the form of a true physical Hamiltonian with respect to the dust time.
Xiangdong Zhang, Yongge Ma
doaj +1 more source
A Covariant Polymerized Scalar Field in Semi-Classical Loop Quantum Gravity
Universe, 2022 We propose a new polymerization scheme for scalar fields coupled to gravity. It has the advantage of being a (non-bijective) canonical transformation of the fields, and therefore ensures the covariance of the theory.
Rodolfo Gambini +2 more
doaj +1 more source
Loop quantum gravity and cosmological constant
Physics Letters B, 2021 A one-parameter regularization freedom of the Hamiltonian constraint for loop quantum gravity is analyzed. The corresponding spatially flat, homogenous and isotropic model includes the two well-known models of loop quantum cosmology as special cases. The
Xiangdong Zhang, Gaoping Long, Yongge Ma
doaj +1 more source