Results 91 to 100 of about 186,264 (366)
Quantum gravity fluctuations in the timelike Raychaudhuri equation
Journal of High Energy Physics, 2023 We consider a timelike geodesic congruence in the presence of perturbative quantum fluctuations of the spacetime metric. We calculate the change in the volume of a bundle of geodesics due to such fluctuations and thereby obtain a quantum-gravitationally ...
Sang-Eon Bak +3 more
doaj +1 more source
Some No-go Theorems for String Duals of Non-relativistic Lifshitz-like Theories
, 2009 We study possibilities of string theory embeddings of the gravity duals for non-relativistic Lifshitz-like theories with anisotropic scale invariance. We search classical solutions in type IIA and eleven-dimensional supergravities which are expected to ...
+43 more
core +1 more source
Advanced Functional Materials, EarlyView.This review explores functional and responsive materials for triboelectric nanogenerators (TENGs) in sustainable smart agriculture. It examines how particulate contamination and dirt affect charge transfer and efficiency. Environmental challenges and strategies to enhance durability and responsiveness are outlined, including active functional layers ...
Rafael R. A. Silva +9 more
wiley +1 more source
Journal of High Energy PhysicsSome time ago, the standard geometric framework of Einstein gravity was extended by gauging the Maxwell algebra as well as the so called AdS-Maxwell algebra.
L. Avilés +4 more
doaj +1 more source
Tree-level scattering amplitudes in nonlocal field theories
Journal of High Energy Physics, 2021 We prove in two ways that, for a special class of nonlocal field theories consistent with linear and non-linear stability at the classical level, and with unitarity and super-renormalizability or finiteness at the quantum level, the n-point tree-level ...
Leonardo Modesto, Gianluca Calcagni
doaj +1 more source
Representations of the holonomy algebras of gravity and nonAbelian gauge theories [PDF]
, 1992 Holonomy algebras arise naturally in the classical description of Yang-Mills fields and gravity, and it has been suggested, at a heuristic level, that they may also play an important role in a nonperturbative treatment of the quantum theory.
A. Ashtekar, C. Isham
semanticscholar +1 more source
Graviton-photon oscillation in alternative theories of gravity [PDF]
, 2018 In this paper we investigate graviton-photon oscillation in the presence of an external magnetic field in alternative theories of gravity. Whereas the effect of an effective refractive index for the electromagnetic radiation was already considered in the
Cembranos, Jose A. R. +2 more
core +3 more sources
The Effect of Amino Acids on the Formation of Amorphous Calcium Carbonate Nanoparticles
Advanced Functional Materials, EarlyView.Biomineral formation often proceeds via the assembly of amorphous calcium carbonate (ACC) nanoparticles with narrow size distributions. Using in situ SAXS coupled to a stopped‐flow device, we follow synthetic ACC formation with a 10 ms time resolution and show that amino acids narrow the size distribution at low supersaturation, highlighting their key ...
Lucas Kuhrts +10 more
wiley +1 more source
How unimodular gravity theories differ from general relativity at quantum level [PDF]
, 2015 We investigate path integral quantization of two versions of unimodular gravity. First a fully diffeomorphism-invariant theory is analyzed, which does not include a unimodular condition on the metric, while still being equivalent to other unimodular ...
R. Bufalo +3 more
semanticscholar +1 more source
A unified theory of gravity and electromagnetism: Classical and quantum aspects [PDF]
Pramana, 2019 A unified classical theory of gravity and electromagnetism with a torsion vector $$\Gamma _i \ne 0$$ , proposed by S N Bose in 1952, is introduced.
openaire +1 more source