Results 111 to 120 of about 2,908,412 (339)

A New Class of Group Field Theories for 1st Order Discrete Quantum Gravity

, 2007
Group Field Theories, a generalization of matrix models for 2d gravity, represent a 2nd quantization of both loop quantum gravity and simplicial quantum gravity.
Baez J C, Barrett J W, D Oriti, Engle J Pereira R Rovelli C, Freidel L, Freidel L, Freidel L Krasnov K, Freidel L Krasnov K Oriti D, Gelfand I M, Gradshteyn I S, Hamber H W, Hermann R, Livine E Speziale S, Oriti D, Oriti D, Oriti D, Oriti D, Perez A, Perez A Bojowald M, Reisenberger M, Rivers R J, Rovelli C, T Tlas, Williams R   +23 more
core   +1 more source

Self-dual pp-wave solutions in chiral higher-spin gravity

Journal of High Energy Physics
We show that chiral higher-spin gravity with a vanishing cosmological constant admits a class of exact self-dual pp-wave solutions derived from harmonic scalar functions and two principal spinors.
Tung Tran
doaj   +1 more source

Fully Printed Variable Orifice Flowmeter with Built‐In Temperature Compensation for Application in Mechanical Ventilation

Advanced Sensor Research, EarlyView.
Additive manufacturing, specifically fused deposition modeling, offers an innovative approach to creating 3D‐printed variable orifice flowmeters with integrated temperature compensation. Using carbon‐black TPU, the primary component (a variable orifice) and the secondary element (a diaphragm pressure sensor) are fabricated.
Vincenzo Saroli, Emiliano Schena, Carlo Massaroni   +2 more
wiley   +1 more source

Strong gravity signatures in the polarization of gravitational waves

, 2019
General Relativity is a hugely successful description of gravitation. However, both theory and observations suggest that General Relativity might have significant classical and quantum corrections in the Strong Gravity regime.
Shankaranarayanan, S.
core   +1 more source

Double layers in gravity theories [PDF]

, 2014
Gravitational double layers, unlike their classical electromagnetic counterparts, are thought to be forbidden in gravity theories. It has been recently shown, however, that they are feasible in, for instance, gravity theories with a Lagrangian quadratic ...
Senovilla, José M. M.
core   +4 more sources

Analysis of Electronic Structure and Binding Energy in Five‐Electron GaAs/AlxGa1‐xAs Quantum Dots Under Penetrable Confinement Potential

Advanced Theory and Simulations, EarlyView.
This study analyses the electronic structure of five‐electron spherical quantum dots with penetrable confinement potential. Spatial confinement and the influence of potential barrier height give rise to the unique properties of quantum dots. These effects lead to profound changes in their energy spectra and optical properties which play a key role in ...
Yusuf Yakar, Bekir Çakır, Ayhan Özmen
wiley   +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

Five-point superluminality bounds

Journal of High Energy Physics
We investigate how the speed of propagation of physical excitations is encoded in the coefficients of five-point interactions. This leads to a superluminality bound on scalar five-point interactions, which we present here for the first time.
Francesco Serra, Leonardo G. Trombetta
doaj   +1 more source

Pregeometry and spontaneous time-space asymmetry

Journal of High Energy Physics, 2022
In pregeometry a metric arises as a composite object at large distances. We investigate if its signature, which distinguishes between time and space, could be a result of the dynamics rather than being built in already in the formulation of a model.
C. Wetterich
doaj   +1 more source

FMint: Bridging Human Designed and Data Pretrained Models for Differential Equation Foundation Model for Dynamical Simulation

Advanced Theory and Simulations, EarlyView.
FMint is introduced as a multi‐modal foundation model that integrates human‐designed solvers and data‐driven methods for fast, accurate simulation of dynamical systems. FMint leverages in‐context learning within a transformer‐based framework to refine coarse numerical solutions.
Zezheng Song, Jiaxin Yuan, Haizhao Yang
wiley   +1 more source