Results 101 to 110 of about 45,346 (288)

Finiteness and Dual Variables for Lorentzian Spin Foam Models

, 2005
We describe here some new results concerning the Lorentzian Barrett-Crane model, a well-known spin foam formulation of quantum gravity. Generalizing an existing finiteness result, we provide a concise proof of finiteness of the partition function ...
Apostol T M, Ashtekar A, Baez J C, Baez J C, Baez J C, Baez J C, Barrett J W, Barrett J W, Barrett J W, Barrett J W, Barrett J W, Bojowald M Perez A, Borwein J, Cherrington J W, Cherrington J W Christensen J D, Christensen J D, Christensen J D, Crane L Perez A Rovelli C, Freidel L, J Wade Cherrington, Makela J, Makela J, Perez A, Pfeiffer H, Wainwright C   +24 more
core   +1 more source

High‐Energy‐Density Aqueous Zinc‐Ion Batteries: Recent Progress, Design Strategies, Challenges, and Perspectives

Advanced Materials, EarlyView.
Strategies achieving high‐energy‐density aqueous zinc‐ion batteries are summarized and analyzed from both their separate advancements and the integrated effectiveness in this review. Then, perspectives are given for valuable guidance for further development of high‐energy‐density aqueous zinc‐ion batteries.
Mingcong Tang, Qun Liu, Xiaohong Zou, Biao Zhang, Liang An   +4 more
wiley   +1 more source

Three dimensional loop quantum gravity: physical scalar product and spin foam models

, 2004
In this paper, we address the problem of the dynamics in three dimensional loop quantum gravity with zero cosmological constant. We construct a rigorous definition of Rovelli's generalized projection operator from the kinematical Hilbert space ...
Alejandro Perez, Alekseev A Yu, Arnsdorf M, Ashtekar A, Ashtekar A, Baez J C, Baez J C, Bojowald A Perez M, Buffenoir E, Carlip S, De Pietri R, Freidel L, Girelli F, Karim Noui, Livine E R, Marolf D, Mikovic A, Perez A, Perez K Noui A, Reisenberger M P, Rovelli C, Rovelli C, Rovelli C, Rovelli C, Thiemann T, Thiemann T, Thiemann T, Thiemann T, Thiemann T, Turaev V G   +29 more
core   +2 more sources

Mussel‐Inspired Molecular Strategies for Fabricating Functional Materials With Underwater Adhesion and Self‐Healing Properties

Advanced Materials, EarlyView.
This review systematically examines the nanomechanical mechanisms of mussel‐inspired molecular interactions, primarily investigated by direct force measurement techniques such as surface forces apparatus and atomic force microscopy. The macroscopic adhesive and self‐healing performances of mussel‐inspired functional materials, including coacervates ...
Pan Huang, Hongjian Zhang, Hongbo Zeng
wiley   +1 more source

Quantum gravity kinematics from extended TQFTs

New Journal of Physics, 2017
In this paper, we show how extended topological quantum field theories (TQFTs) can be used to obtain a kinematical setup for quantum gravity, i.e. a kinematical Hilbert space together with a representation of the observable algebra including operators of
Bianca Dittrich, Marc Geiller
doaj   +1 more source

Toward Zero‐Excess Alkali Metal Batteries: Bridging Experimental and Computational Insights

Advanced Materials, EarlyView.
This review explores zero‐excess alkali metal batteries, highlighting anode–electrolyte interfaces, metal nucleation, dendrite growth, and SEI formation while comparing Li, Na, and K metals. It critically examines electrolyte and separator roles, emphasizing substrate design, electrolyte modifications, interfacial engineering, and solid‐state ...
Pan He, Neubi Francisco Xavier Jr, Matthias Johannes Golomb, Yupei Han, Yuheng Du, Qiong Cai, Yang Xu   +6 more
wiley   +1 more source

Feynman diagrammatic approach to spin foams

, 2011
"The Spin Foams for People Without the 3d/4d Imagination" could be an alternative title of our work. We derive spin foams from operator spin network diagrams} we introduce. Our diagrams are the spin network analogy of the Feynman diagrams.
Alesci E Bianchi E Rovelli C, Ashtekar A, Ashtekar A, Ashtekar A, Ashtekar A, Bahr B, Bahr B, Baratin A Flori C Thiemann T, Baratin A Flori C Thiemann T, Barrett J W, Bianchi E, Bianchi E, Bonzom V, Dittrich B Ryan J P, Engle J Han M Thiemann T, Freidel L, Geloun J B Gurau R Rivasseau V, Han M Thiemann T, Han M Thiemann T, Hatcher A, Hellmann F, Jacek Puchta, Jerzy Lewandowski, Kamiński W, Kamiński W, Kamiński W, Kamiński W Kisielowski M Lewandowski J, Krajewski T Magnen J Rivasseau V Tanasa A Vitale P, Livine E R, Mamone D Rovelli C, Marcin Kisielowski, Markopoulou F, Noui K, Perez A, Reisenberger M P, Rovelli C, Rovelli C, Rovelli C Smerlak M, Yetter D   +38 more
core   +3 more sources

Active Fabric Origami Enabled by Digital Embroidery of Magnetic Yarns

Advanced Materials, EarlyView.
This study demonstrates a scalable textile manufacturing process that fabricates active origami fabrics (AFO) via digital embroidery of magnetic yarns. The programmable AFO exhibits reversible 2D and 3D transformations under magnetic fields, enabling functionalities such as altering surface roughness and linear actuation.
Haiqiong Li, Han Zhang, Xiangjun Zha, Junhong Pu   +3 more
wiley   +1 more source

Quantum Gravity as a Broken Symmetry Phase of a BF Theory

Symmetry, Integrability and Geometry: Methods and Applications, 2006
We explain how General Relativity with a cosmological constant arises as a broken symmetry phase of a BF theory. In particular we show how to treat de Sitter and anti-de Sitter cases simultaneously.
Aleksandar Miković
doaj  

A finiteness bound for the EPRL/FK spin foam model

, 2013
We show that the EPRL/FK spin foam model of quantum gravity has an absolutely convergent partition function if the vertex amplitude is divided by an appropriate power $p$ of the product of dimensions of the vertex spins.
Aleksandar Miković, Baez J, Barrett J, Bianchi E, Conrady F, Freidel L, Marko Vojinović, Miković A, Miković A, Miković A, Rovelli C   +10 more
core   +1 more source