Results 71 to 80 of about 1,342,913 (205)

The emergence of spacetime, or, quantum gravity on your desktop [PDF]

, 2008
Is there an approach to quantum gravity which is conceptually simple, relies on very few fundamental physical principles and ingredients, emphasizes geometric (as opposed to algebraic) properties, comes with a definite numerical approximation scheme, and
Dep Natuurkunde, Quantum Gravity, Strings and Elementary Particles, Loll, R.   +2 more
core  

Assessing the Relative Roles of Soil Water Potential and Atmospheric Demand on Vegetation Water Stress in Semi‐arid Ecosystems

Journal of Geophysical Research: Biogeosciences, Volume 131, Issue 7, July 2026.
Abstract Understanding vegetation's response to soil water availability and atmospheric demand is critical for assessing the impact of drought and climate change on semi‐arid ecosystems. However, limited field‐based research has been conducted to assess the relative importance of these drivers on vegetation productivity.
Kayla Jamerson, Zachary H. Hoylman, Anna Sala, Ashley Ballantyne, Colin Brust, Kelsey G. Jencso   +5 more
wiley   +1 more source

A new class of group field theories for 1st order discrete quantum gravity [PDF]

, 2008
Group Field Theories, a generalization of matrix models for 2d gravity, represent a 2nd quantization of both loop quantum gravity and simplicial quantum gravity.
Afd Theoretical Physics (ITF), Oriti, D., Tlas, T., Quantum Gravity, Strings and Elementary Particles   +3 more
core  

Modular Hamiltonians in flat holography and (W)AdS/WCFT

Journal of High Energy Physics, 2020
We study several aspects of holographic entanglement in two models known as flat3/BMSFT and (W)AdS3/WCFT. These are two examples of holography beyond AdS/CFT where the boundary field theories are not Lorentz invariant but still feature an infinite set of
Luis Apolo, Hongliang Jiang, Wei Song, Yuan Zhong   +3 more
doaj   +1 more source

Drivers of Water Resource Changes Over the Mediterranean Climate Regions of the Northern Hemisphere

Earth's Future, Volume 14, Issue 7, July 2026.
Abstract Mediterranean Climate Regions (MCRs) are water‐limited areas highly sensitive to global warming and hydroclimatic change. However, long‐term declines and interannual variability in water availability, as well as their climate drivers, remain poorly understood. This study exploits the GRACE/GRACE‐FO satellite observations of Total Water Storage
V. Senigalliesi, A. Cherchi, S. Gelsinari, A. Alessandri   +3 more
wiley   +1 more source

A New Spin on the Hole Argument [PDF]

, 2004
This brief paper shows how an exact analogue of Einstein's original hole argument can be constructed in the loop representation of quantum gravity.
Rickles, Dean
core  

Entanglement entropy of quantum corners

Journal of High Energy Physics
In gravitational theories with boundaries, diffeomorphisms can become physical and acquire a non-vanishing Noether charge. Using the covariant phase space formalism, on shell of the gravitational constraints, the latter localizes on codimension-2 ...
Luca Ciambelli, Jerzy Kowalski-Glikman, Ludovic Varrin   +2 more
doaj   +1 more source

A Simple Stomatal Model That Unifies the Metabolic and Hydraulic Control of Carbon and Water Flux

Global Change Biology, Volume 32, Issue 7, July 2026.
This figure shows the model's predictions in response to the familiar stomatal effectors. ABSTRACT A striking incongruity has long persisted in the modeling framework typically used to predict CO2 and water vapor exchange between land plants and the atmosphere across scales.
Thomas N. Buckley, Julien Lamour, David M. Barnard, Daniel W. Buckley, Andrew J. Jarvis, Antonio Diaz‐Espejo, Alistair Rogers, Lawren Sack   +7 more
wiley   +1 more source

The covariant formulation of f(T) gravity

, 2016
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)We show that the well-known problem of frame dependence and violation of local Lorentz invariance in the usual formulation of f(T) gravity is a consequence of neglecting the role of spin ...
Krssak, Martin, Saridakis, Emmanuel N., Krssak, Martin [UNESP]   +2 more
core   +1 more source

Complex degenerate metrics in general relativity: a covariant extension of the Moore–Penrose algorithm

European Physical Journal C: Particles and Fields
The Moore–Penrose algorithm provides a generalized notion of an inverse, applicable to degenerate matrices. In this paper, we introduce a covariant extension of the Moore–Penrose method that permits to deal with general relativity involving complex non ...
Arthur Garnier, Emmanuele Battista
doaj   +1 more source