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Realization of a complete Stern-Gerlach interferometer: Toward a test of quantum gravity. [PDF]
Sci Adv, 2021 A full-loop Stern-Gerlach atom interferometer is realized, opening perspectives to examine the quantum nature of gravity. The Stern-Gerlach effect, found a century ago, has become a paradigm of quantum mechanics.
Margalit Y +10 more
europepmc +3 more sources
A short review of loop quantum gravity [PDF]
Reports on progress in physics. Physical Society, 2021 An outstanding open issue in our quest for physics beyond Einstein is the unification of general relativity (GR) and quantum physics. Loop quantum gravity (LQG) is a leading approach toward this goal.
A. Ashtekar, Eugenio Bianchi
semanticscholar +1 more source
Quantum Gravity in 30 Questions [PDF]
Proceedings of Corfu Summer Institute 2021 "School and Workshops on Elementary Particle Physics and Gravity" — PoS(CORFU2021), 2022 Quantum gravity is the missing piece in our understanding of the fundamental interactions today. Given recent observational breakthroughs in gravity, providing a quantum theory for what lies beyond general relativity is more urgent than ever.
R. Loll +3 more
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Solvable models of quantum black holes: a review on Jackiw–Teitelboim gravity [PDF]
Living Reviews in Relativity, 2022 We review recent developments in Jackiw–Teitelboim gravity. This is a simple solvable model of quantum gravity in two dimensions (that arises e.g. from the s-wave sector of higher dimensional gravity systems with spherical symmetry).
T. Mertens, G. Turiaci
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Classical and quantum gravity with fractional operators [PDF]
Classical and quantum gravity, 2021 Following the same steps made for a scalar field in a parallel publication, we propose a class of perturbative theories of quantum gravity based on fractional operators, where the kinetic operator of the graviton is made of either fractional derivatives ...
G. Calcagni
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Quantum Gravity in the Lab. II. Teleportation by Size and Traversable Wormholes [PDF]
PRX Quantum, 2021 In [1] we discussed how quantum gravity may be simulated using quantum devices and gave a specific proposal -- teleportation by size and the phenomenon of size-winding.
Sepehr Nezami +8 more
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Gravity entanglement, quantum reference systems, degrees of freedom [PDF]
Classical and quantum gravity, 2022 Gravity mediated entanglement (GME) has been proposed as the first experimentally testable signature of quantum gravity. However, to what extent the effect is due to quantum gravity is under debate.
Marios Christodoulou +3 more
semanticscholar +1 more source
The Curled Up Dimension in Quasicrystals
Crystals, 2021 Most quasicrystals can be generated by the cut-and-project method from higher dimensional parent lattices. In doing so they lose the periodic order their parent lattice possess, replaced with aperiodic order, due to the irrationality of the projection ...
Fang Fang, Richard Clawson, Klee Irwin
doaj +1 more source
Spherically symmetric loop quantum gravity: analysis of improved dynamics [PDF]
Classical and quantum gravity, 2020 We study the ‘improved dynamics’ for the treatment of spherically symmetric space-times in loop quantum gravity introduced by Chiou et al in analogy with the one that has been constructed by Ashtekar, Pawlowski and Singh for the homogeneous space-times ...
R. Gambini, J. Olmedo, J. Pullin
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Let Loop Quantum Gravity and Affine Quantum Gravity Examine Each Other [PDF]
Journal of High Energy Physics, Gravitation and Cosmology > Vol.7
No.3, July 2021, 2021 Loop Quantum Gravity is widely developed using canonical quantization in an effort to find the correct quantization for gravity. Affine quantization, which is like canonical quantization augmented bounded in one orientation, e.g., a strictly positive coordinate. We open discussion using canonical and affine quantizations for two simple problems so each
arxiv +1 more source