Results 81 to 90 of about 22,396 (181)

Quantum constraints, Dirac observables and evolution: group averaging versus Schroedinger picture in LQC

, 2009
A general quantum constraint of the form $C= - \partial_T^2 \otimes B - I\otimes H$ (realized in particular in Loop Quantum Cosmology models) is studied.
Ashtekar A, Ashtekar A, Ashtekar A Pawłowski T, Bojowald M, Dittrich B, Fulling S A, Giesel K Thiemann T, Jerzy Lewandowski, Kamiński W, Kamiński W, Kamiński W Pawłowski T, Marolf D, Marolf D, Marolf D, Marolf D, Maurin K, Rovelli C, Rovelli C, Szulc L, Thiemann T, Thiemann T, Tomasz Pawłowski, Wojciech Kamiński   +22 more
core   +1 more source

Forecasting Research Trends Using Knowledge Graphs and Large Language Models

Advanced Intelligent Systems, Volume 8, Issue 1, January 2026.
When research trends can be anticipated, academia and industry are able to allocate limited resources more effectively and accelerate innovation. By constructing knowledge graphs using large language models, this study analyzes the time evolution of nuclear materials research concepts and suggests a data‐driven approach of forecasting research trends ...
Maciej Tomczak, Yang Jeong Park, Chia‐Wei Hsu, Payden Brown, Dario Massa, Piotr Sankowski, Ju Li, Stefanos Papanikolaou   +7 more
wiley   +1 more source

Relational Quantum Mechanics and Contextuality

Foundations of Physics
AbstractThis paper discusses the question of stable facts in relational quantum mechanics (RQM). I examine how the approach to quantum logic in the consistent histories formalism can be used to clarify what infomation about a system can be shared between different observers.
openaire   +4 more sources

Aspects of Objectivity in Quantum Mechanics [PDF]

, 1998
The purpose of the paper is to explore different aspects of the covariance of (mostly) non-relativistic quantum mechanics. First, doubts are expressed concerning the claim that gauge fields can be 'generated' by way of imposition of (local) gauge ...
Brown, Harvey R
core  

Triangleland. I. Classical dynamics with exchange of relative angular momentum

, 2009
In Euclidean relational particle mechanics, only relative times, relative angles and relative separations are meaningful. Barbour--Bertotti (1982) theory is of this form and can be viewed as a recovery of (a portion of) Newtonian mechanics from ...
Abrams A Ghrist R, Alexander H G, Anderson E, Anderson E, Anderson E, Anderson E, Anderson E, Anderson E, Anderson E, Anderson E, Anderson E, Anderson E, Anderson E, Anderson E, Anderson E, Anderson E, Anderson E, Anderson E, Anderson E, Anderson E, Anderson E, Anderson E, Anderson E, Anderson E, Anderson E, Anderson E, Anderson E Franzen A, Anderson E O'Loughlin M Stanič S Veberič D, Arnowitt R, Barbour J B, Barbour J B, Barbour J B, Barbour J B, Barbour J B, Barbour J B, Barbour J B, Barbour J B, Barbour J B, Barbour J B, Barbour J B, Barbour J B, Barbour J B Elze H-T, Barbour J B Foster B Z, Barbour J B Smolin L, Barbour J B Ó Murchadha N, Berkeley G, Berkeley G, Cohen I B Whitman A, DeWitt B S Carmeli M Fickler S I Witten L, Dirac P A M, Edward Anderson, Fischer A E Carmeli M Fickler S I Witten L, Gergely L Á, Gergely L Á, Goldstein H, Gourgoulhon E, Guichardet A, Halliwell J J, Hecht K T, Isham C J, Kuchař K V, Kuchař K V Kunstatter G Vincent D Williams J, Lanczos C, Landau L D, Lichnerowicz A, Lynden-Bell D, Mach E, Mach E, MacSweeney P, Marchal C, Messiah A, Montgomery R, Montgomery R, Moulton F R, Moulton F R, Newton I, Peres A, Rovelli C, Shapere A, Townes C H, Wheeler J A, Whittaker E T, York J W, Yoshida T, Ó Murchadha N   +84 more
core   +1 more source

Robotic Needle Steering for Percutaneous Interventions: Sensing, Modeling, and Control

Advanced Intelligent Systems, Volume 8, Issue 1, January 2026.
This review examines recent advances in robotic needle steering for percutaneous interventions, highlighting closed‐loop sensing, physics‐informed tissue‐needle interaction modeling, and real‐time trajectory planning and control. It synthesizes innovations in deep learning, fiber‐optic feedback, and adaptive control strategies, and outlines emerging ...
Fangjiao Zhao, Ruixue Xu, Wujun Zhao, Xi‐Ming Sun, Yu Sun, Changsheng Dai   +5 more
wiley   +1 more source

Times Two: The Tenses of Linear and Collapse Dynamics in Relational Quantum Mechanics [PDF]

, 2008
The nature and topology of time remains an open question in philosophy, both tensed and tenseless concepts of time appear to have merit. A concept of time including both kinds of time evolution of physical systems in quantum mechanics subsumes the ...
Soltau, Andrew
core   +1 more source

Relational Motivation for Conformal Operator Ordering in Quantum Cosmology

, 2009
Operator-ordering in quantum cosmology is a major as-yet unsettled ambiguity with not only formal but also physical consequences. We determine the Lagrangian origin of the conformal invariance that underlies the conformal operator-ordering choice in ...
Anderson, Edward
core   +1 more source

Hydrogel Microspheres for Biomedical Applications

Small Science, Volume 6, Issue 1, January 2026.
Hydrogel microspheres (HMs) play pivotal roles in biomedical applications, such as drug delivery, cell culture, regenerative medicine, wound healing, and tumor immunity. This review focuses on the latest findings to provide a more comprehensive understanding of HMs for biomedical applications.
Yingkang Huang, Xi Zhu, Jinhong Zhou, Henan Li, Wei Zhang, Danyang Shen, Ziyan Huang, Tianbo Zhang, Lin Zhuang, Lei Qin, Xiaofeng Xue, Yunjie Lu   +11 more
wiley   +1 more source

Minimal areas from entangled matrices

SciPost Physics
We define a relational notion of a subsystem in theories of matrix quantum mechanics and show how the corresponding entanglement entropy can be given as a minimisation, exhibiting many similarities to the Ryu-Takayanagi formula.
Jackson R. Fliss, Alexander Frenkel, Sean A. Hartnoll, Ronak M. Soni
doaj   +1 more source