On the black hole singularity issue in loop quantum gravityThis paper was presented at the Theory CANADA 4 conference, held at Centre de recherches mathématiques, Montréal, Québec, Canada on 4–7 June 2008.

2009 ◽  
Vol 87 (3) ◽  
pp. 255-262 ◽  
Author(s):  
A. DeBenedictis
Keyword(s):  
Black Hole ◽  
Quantum Gravity ◽  
Loop Quantum Gravity ◽  
Technical Detail ◽  
Current Work ◽  
Intended Audience ◽  
Black Hole Singularity ◽  
Singularity Resolution

This paper presents a brief overview on the issue of singularity resolution in loop quantum gravity presented at the Theory CANADA IV conference at the Centre de Recherches Mathématiques at the Université de Montréal. The intended audience is theoretical physicists who are non-specialist in the field, and therefore much of the technical detail is omitted here. Instead, a brief review of loop quantum gravity is presented followed by a survey of previous and current work on results concerning the resolution of the classical black hole singularity within loop quantum gravity.

scholarly journals Black hole singularity resolution via the modified Raychaudhuri equation in loop quantum gravity

2021 ◽  
Vol 103 (8) ◽  
Author(s):  
Keagan Blanchette ◽  
Saurya Das ◽  
Samantha Hergott ◽  
Saeed Rastgoo
Keyword(s):  
Black Hole ◽  
Quantum Gravity ◽  
Loop Quantum Gravity ◽  
Raychaudhuri Equation ◽  
Black Hole Singularity ◽  
Singularity Resolution

scholarly journals Loop Quantum Black Hole Extensions Within the Improved Dynamics

2021 ◽  
Vol 8 ◽  
Author(s):  
Rodolfo Gambini ◽  
Javier Olmedo ◽  
Jorge Pullin
Keyword(s):  
Black Hole ◽  
Quantum Gravity ◽  
Loop Quantum Gravity ◽  
Space Time ◽  
Anisotropic Fluid ◽  
Spherically Symmetric ◽  
Quantization Scheme ◽  
White Hole ◽  
Quantum Black Hole ◽  
Black Hole Singularity

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 states that approximate general relativity coupled to an effective anisotropic fluid. The singularity is eliminated and the space-time can be continued into a white hole space-time. This is similar to previously considered scenarios based on a loop quantum gravity quantization.

scholarly journals Towards Black-Hole Singularity-Resolution in the Lorentzian Gravitational Path Integral

Universe ◽  
2021 ◽  
Vol 7 (3) ◽  
pp. 48
Author(s):  
Johanna N. Borissova ◽  
Astrid Eichhorn
Keyword(s):  
General Relativity ◽  
Black Hole ◽  
Quantum Gravity ◽  
Path Integral ◽  
Higher Order ◽  
Destructive Interference ◽  
Spherically Symmetric ◽  
Dynamical Mechanism ◽  
Black Hole Singularity ◽  
Singularity Resolution

Quantum gravity is expected to resolve the singularities of classical general relativity. Based on destructive interference of singular spacetime-configurations in the path integral, we find that higher-order curvature terms may allow to resolve black-hole singularities both in the spherically symmetric and axisymmetric case. In contrast, the Einstein action does not provide a dynamical mechanism for singularity-resolution through destructive interference of these configurations.

scholarly journals Towards conditions for black-hole singularity-resolution in asymptotically safe quantum gravity

2018 ◽  
Vol 35 (22) ◽  
pp. 225007 ◽  
Author(s):  
Adémólá Adéìféoba ◽  
Astrid Eichhorn ◽  
Alessia Benedetta Platania
Keyword(s):  
Black Hole ◽  
Quantum Gravity ◽  
Black Hole Singularity ◽  
Singularity Resolution

scholarly journals Quantum gravity: A brief history of ideas and some prospects

2015 ◽  
Vol 24 (11) ◽  
pp. 1530028 ◽  
Author(s):  
Steven Carlip ◽  
Dah-Wei Chiou ◽  
Wei-Tou Ni ◽  
Richard Woodard
Keyword(s):  
Black Hole ◽  
String Theory ◽  
Quantum Gravity ◽  
Loop Quantum Gravity ◽  
Black Hole Thermodynamics ◽  
History Of Ideas ◽  
Foreseeable Future ◽  
Gravitational Effects ◽  
History Of

We present a bird's-eye survey on the development of fundamental ideas of quantum gravity, placing emphasis on perturbative approaches, string theory, loop quantum gravity (LQG) and black hole thermodynamics. The early ideas at the dawn of quantum gravity as well as the possible observations of quantum gravitational effects in the foreseeable future are also briefly discussed.

scholarly journals Black Hole Interior from Loop Quantum Gravity

2008 ◽  
Vol 2008 ◽  
pp. 1-12 ◽  
Author(s):  
Leonardo Modesto
Keyword(s):  
Black Hole ◽  
Quantum Gravity ◽  
Event Horizon ◽  
Loop Quantum Gravity ◽  
Planck Scale ◽  
Semiclassical Analysis ◽  
Schwarzschild Solution ◽  
Quantum Black Hole ◽  
Minimum Value ◽  
Black Hole Interior

We calculate modifications to the Schwarzschild solution by using a semiclassical analysis of loop quantum black hole. We obtain a metric inside the event horizon that coincides with the Schwarzschild solution near the horizon but that is substantially different at the Planck scale. In particular, we obtain a bounce of theS2sphere for a minimum value of the radius and that it is possible to have another event horizon close to ther=0point.

scholarly journals ENTROPY AND AREA IN LOOP QUANTUM GRAVITY

2005 ◽  
Vol 14 (12) ◽  
pp. 2301-2305
Author(s):  
JOHN SWAIN
Keyword(s):  
Black Hole ◽  
Quantum Gravity ◽  
Maximum Entropy ◽  
Degrees Of Freedom ◽  
Loop Quantum Gravity ◽  
Black Hole Entropy ◽  
Black Hole Thermodynamics ◽  
Three Dimensions ◽  
Spin Network

Black hole thermodynamics suggests that the maximum entropy that can be contained in a region of space is proportional to the area enclosing it rather than its volume. We argue that this follows naturally from loop quantum gravity and a result of Kolmogorov and Bardzin' on the the realizability of networks in three dimensions. This represents an alternative to other approaches in which some sort of correlation between field configurations helps limit the degrees of freedom within a region. It also provides an approach to thinking about black hole entropy in terms of states inside rather than on its surface. Intuitively, a spin network complicated enough to imbue a region with volume only lets that volume grow as quickly as the area bounding it.

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