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Twisted geometries coherent states for loop quantum gravity [PDF]
Classical and quantum gravity, 2020 We introduce a new family of coherent states for loop quantum gravity, inspired by the twisted geometry parametrization. We compute their peakedness properties and compare them with the heat-kernel coherent states. They show similar features for the area
Andrea Calcinari +3 more
semanticscholar +1 more source
No-go result for covariance in models of loop quantum gravity [PDF]
, 2020 Based on the observation that the exterior space-times of Schwarzschild-type solutions allow two symmetric slicings, a static spherically symmetric one and a timelike homogeneous one, modifications of gravitational dynamics suggested by symmetry-reduced ...
M. Bojowald
semanticscholar +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 Observations [PDF]
, 2017 Quantum gravity has long been thought to be completely decoupled from experiments or observations. Although it is true that smoking guns are still missing, there are now serious hopes that quantum gravity phenomena might be tested. We review here some possible ways to observe loop quantum gravity effects either in the framework of cosmology or in ...
Barrau, A., Grain, J.
openaire +5 more sources
Polyhedra in loop quantum gravity [PDF]
Physical Review D, 2011 Interwiners are the building blocks of spin-network states. The space of intertwiners is the quantization of a classical symplectic manifold introduced by Kapovich and Millson. Here we show that a theorem by Minkowski allows us to interpret generic configurations in this space as bounded convex polyhedra in Euclidean space: a polyhedron is uniquely ...
Bianchi, Eugenio +2 more
openaire +3 more sources
Testing loop quantum cosmology [PDF]
, 2017 Loop quantum cosmology predicts that quantum gravity effects resolve the big-bang singularity and replace it by a cosmic bounce. Furthermore, loop quantum cosmology can also modify the form of primordial cosmological perturbations, for example by ...
Wilson-Ewing, Edward
core +2 more sources
Quantum Reduced Loop Gravity [PDF]
Proceedings of Frontiers of Fundamental Physics 14 — PoS(FFP14), 2016 Quantum Reduced Loop Gravity provides a promising framework for a consistent characterization of the early Universe dynamics. Inspired by BKL conjecture, a flat Universe is described as a collection of Bianchi I homogeneous patches. The resulting quantum dynamics is described by the scalar constraint operator, whose matrix elements can be analytically ...
ALESCI, Emanuele, Cianfrani, F.
openaire +4 more sources
Graph coherent states for loop quantum gravity [PDF]
Phys. Rev. D 101, 124022 (2020), 2020 In this article we further investigate the construction of graph coherent states, first introduced in [1], in the context of loop quantum gravity. We specifically investigate the possibility of defining a family of graph coherent states adapted to the canonical loop quantum gravity Hamiltonian.
arxiv +1 more source
Quantum self-gravitating collapsing matter in a quantum geometry [PDF]
, 2016 The problem of how space-time responds to gravitating quantum matter in full quantum gravity has been one of the main questions that any program of quantization of gravity should address.
Campiglia, Miguel +3 more
core +3 more sources
Astronomische Nachrichten, 2011 AbstractIn this talk, I give a short general introduction to Loop Quantum Gravity (LQG), beginning with some motivations for quantizing General Relativity, listing various attempts and then focusing on the case of LQG. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
openaire +3 more sources