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Quantum Gravity: Has Spacetime Quantum Properties? [PDF]
, 2009 The conceptual incompatibility between General Relativity and Quantum Mechanics is generally seen as a sufficient motivation for the development of a theory of Quantum Gravity. If - so a typical argumentation - Quantum Mechanics gives a universally valid
Hedrich, Reiner
core
Generalized covariant entropy bound in Einstein gravity with quadratic curvature corrections
Journal of High Energy PhysicsWe explore the generalized covariant entropy bound in the theory where Einstein gravity is perturbed by quadratic curvature terms, which can be viewed as the first-order quantum correction to Einstein gravity.
Hu Zhu, Jie Jiang
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On the possibility of laboratory evidence for quantum superposition of geometries
Physics Letters B, 2019 We analyse the recent proposal of measuring a quantum gravity phenomenon in the lab by entangling two mesoscopic particles gravitationally. We give a generally covariant description of this phenomenon, where the relevant effect turns out to be a quantum ...
Marios Christodoulou, Carlo Rovelli
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Direct Numerical Simulations of Inhalation in a 23‐Generation Lung Model
International Journal for Numerical Methods in Biomedical Engineering, Volume 42, Issue 8, August 2026.The first direct numerical simulation of a 23‐bifurcation lung model is carried out. Fast and intense oscillations in the laminar flow are found in deep generations: their time scales are related to the upstream pressure fluctuations, and their intensity is related to upstream flow‐splitting fluctuations.
Marco Atzori +4 more
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Fortschritte der Physik, Volume 74, Issue 8, August 2026.ABSTRACT We analytically construct initial data for binary black hole systems by solving the Einstein constraint equations within the Bowen–York framework. Allowing for arbitrarily oriented linear momenta and spins, we obtain a perturbative solution of the vacuum Hamiltonian constraint up to third order in the source parameters. Our solution explicitly
Leyla Ogurol, Tore Boybeyi, Bayram Tekin
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Algebraic Approach to Quantum Gravity: relative realism [PDF]
, 2007 In the first of three articles, we review the philosophical foundations of an approach to quantum gravity based on a principle of representation-theoretic duality and a vaguely Kantian-Buddist perspective on the nature of physical reality which I have ...
Majid, Shahn
core
Interactions in the IKKT matrix model on covariant quantum spacetime
Nuclear Physics BWe study the interactions of the higher-spin gauge theory arising from the IKKT matrix model on a covariant quantum FLRW quantum space-time MJ1,3, denoted as HS-IKKT.
Harold C. Steinacker, Tung Tran
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Hamiltonian approach to GR – Part 2: covariant theory of quantum gravity
European Physical Journal C: Particles and Fields, 2017 A non-perturbative quantum field theory of General Relativity is presented which leads to a new realization of the theory of covariant quantum gravity (CQG-theory). The treatment is founded on the recently identified Hamiltonian structure associated with
Claudio Cremaschini, Massimo Tessarotto
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Foliated asymptotically safe gravity in the fluctuation approach
Journal of High Energy Physics, 2023 The gravitational asymptotic safety program envisions a high-energy completion of gravity based on a non-Gaussian renormalization group fixed point. A key step in this program is the transition from Euclidean to Lorentzian signature spacetimes.
Frank Saueressig, Jian Wang
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Carbon, Water, and Energy Flux Dynamics in Different Cropping Systems in the Great Lakes Region
Journal of Geophysical Research: Biogeosciences, Volume 131, Issue 8, August 2026.Abstract This study examined carbon (C), water, and energy exchanges across different cropping systems in the Great Lakes region using eddy covariance (EC) fluxes from an agricultural flux tower site (CA‐TPA) in southern Ontario, Canada. The site was cultivated with corn in 2020 and 2021, sweet potato in 2022, and tobacco in 2023. The site was a strong
M. Altaf Arain +4 more
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