Results 111 to 120 of about 46,248 (301)
NEW SPIN FOAM MODELS OF QUANTUM GRAVITY [PDF]
Modern Physics Letters A, 2005 We give a brief and a critical review of the Barret-Crane spin foam models of quantum gravity. Then we describe two new spin foam models which are obtained by direct quantization of General Relativity and do not have some of the drawbacks of the Barret-Crane models.
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Advanced Materials, EarlyView.TGTMW fibers are designed to show a sharp resistance increase under pressure, as the multi‐wall structure in the transition region between compressed and uncompressed areas bends and forms microcracks. This design breaks the physical sensitivity limit of conventional fiber‐shaped pressure sensors, which usually show resistance reduction under pressure ...
Ziwei Chen +7 more
wiley +1 more source
Geometric spin foams, Yang-Mills theory and background-independent models
, 2005 We review the dual transformation from pure lattice gauge theory to spin foam models with an emphasis on a geometric viewpoint. This allows us to give a simple dual formulation of SU(N) Yang-Mills theory, where spin foam surfaces are weighted with the ...
Conrady, Florian
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Ponzano-Regge model revisited III: Feynman diagrams and Effective field theory
, 2005 We study the no gravity limit G_{N}-> 0 of the Ponzano-Regge amplitudes with massive particles and show that we recover in this limit Feynman graph amplitudes (with Hadamard propagator) expressed as an abelian spin foam model.
Akhmedov E T +26 more
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A Smart and Highly Porous Hydrogel for Diabetic Wound Healing
Advanced Materials Interfaces, EarlyView.A novel hydrogel comprising a dual‐crosslinked network of Poly(N‐isopropylacrylamide) (PNIPAM) and Gum Arabic (GA) with superior mechanical and anti‐inflammatory properties is designed for advanced diabetic wound healing. Abstract Conventional hydrogels often suffer from poor mechanical strength, limited bioactivity, and uncontrolled therapeutic ...
Nouf Al Saleh +9 more
wiley +1 more source
On background-independent renormalization of spin foam models [PDF]
Classical and Quantum Gravity, 2016 23 pages, 12 figures, updated ...
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Advanced Materials Interfaces, EarlyView.The molecular level understanding of proteins at oil‐water interfaces is deepened. Cruciferin assumes trimeric conformations at the interface, as in solution. Interfacial mobility is only marginally lower than in solution, indicating the chemical structure preserves a network.
Olaf Holderer +12 more
wiley +1 more source
Biocompatibility and Long‐Term Stability of DNA‐Based Organic Mixed Conductors for Bioelectronics
Advanced Materials Interfaces, EarlyView.The biocompatibility and long‐term stability of DNA‐based mixed ionic‐electronic conductors are investigated. In vitro cytotoxicity and cell viability are assessed using flow cytometry assay on primary mouse fibroblasts cultures. The biocomposites are integrated into organic electrochemical transistors (OECTs) to determine the stability of their ...
Sarka Hradilova +7 more
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Gluing 4-simplices: A derivation of the Barrett-Crane spin foam model for Euclidean quantum gravity [PDF]
, 2000 Daniele Oriti, Ruth M. Williams
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The Barrett-Crane model: asymptotic measure factor
, 2014 The original spin foam model construction for 4D gravity by Barrett and Crane suffers from a few troubling issues. In the simple examples of the vertex amplitude they can be summarized as the existence of contributions to the asymptotics from non ...
Kaminski, Wojciech, Steinhaus, Sebastian
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