Results 161 to 170 of about 186,264 (366)

Local phase space and edge modes for diffeomorphism-invariant theories

Journal of High Energy Physics, 2018
We discuss an approach to characterizing local degrees of freedom of a subregion in diffeomorphism-invariant theories using the extended phase space of Donnelly and Freidel [36].
Antony J. Speranza
doaj   +1 more source

Can the notion of a homogeneous gravitational field be transferred from classical mechanics to the Relativistic Theory of Gravity ? [PDF]

, 2002
Delia Ionescu-Kruse
openalex   +1 more source

How the non-metricity of the connection arises naturally in the classical theory of gravity [PDF]

, 2022
B. Bąk, J. Kijowski
openalex   +1 more source

Gravity from the extension of spatial diffeomorphisms

, 2010
The possibility of the extension of spatial diffeomorphisms to a larger family of symmetries in a class of classical field theories is studied. The generator of the additional local symmetry contains a quadratic kinetic term and a potential term which ...
Arnowitt R. L., Emil J. Martinec, Hanson A., Szilard Farkas, Teitelboim C.   +4 more
core   +1 more source

Contact Force Estimation of Continuum Robots without Embedded Sensors: A Review

Advanced Intelligent Systems, EarlyView.
This review surveys methods for estimating contact forces in continuum robots without embedded sensors. It explains why contact force matters, classifies force patterns, and groups existing methods into three approaches based on actuation, deformation, and environment information.
An Hu, Yu Sun
wiley   +1 more source

Modeling and Characterization of a Self‐Sensing Soft Hydraulic Muscle

Advanced Intelligent Systems, EarlyView.
This article presents the self‐sensing soft hydraulic muscle (SSHM), a novel soft actuator capable of simultaneously sensing force and length without external sensors. A comprehensive model accurately predicts SSHM behavior, validated experimentally with minimal errors. Using propylene glycol enhances durability and reduces hysteresis.
Nhu An Phan, Phuong Linh Dao, Duc Tu Vu, The Doan Le, Sy Trung Ngo, Minh Tri Phan, T. Thang Vo‐Doan, Ke Wu, Mai Thanh Thai   +8 more
wiley   +1 more source

A path integral formula of quantum gravity emergent from entangled local structures

Journal of High Energy Physics
We couple to group field theory (GFT) a scalar field that encodes the entanglement between manifold sites. The scalar field provides a relational clock that enables the derivation of the Hamiltonian of the system from the GFT action.
Jinglong Liu, Stephon Alexander, Antonino Marcianò, Roman Pasechnik   +3 more
doaj   +1 more source

Identity for scalar-valued functions of tensors and its applications to energy-momentum tensors in classical field theories and gravity [PDF]

, 2021
Jürgen Struckmeier, David Vasak, Armin van de Venn   +2 more
openalex   +1 more source

Giving and receiving help in three contexts as predictors of alcohol outcomes in a longitudinal study of sober living house residents

American Journal of Community Psychology, EarlyView.
Abstract Although peer support is central to the social model approach emphasized in sober living houses (SLHs), no longitudinal studies have examined helping among SLH residents. This longitudinal study examined benefits of helping in three contexts among SLH residents. Data were from 205 participants entering 28 SLHs across 2021–2023. Interviews were
Sarah E. Zemore, Elizabeth Mahoney, Meenakshi S. Subbaraman, Amy A. Mericle, Douglas L. Polcin   +4 more
wiley   +1 more source

Classical gravity coupled to Liouville theory [PDF]

, 1993
Francisco D. Mazzitelli, Noureddine Mohammedi   +1 more
openalex   +1 more source