Results 41 to 50 of about 47,494 (299)
Spin-Foam Models and the Physical Scalar Product [PDF]
, 2008 This paper aims at clarifying the link between Loop Quantum Gravity and Spin-Foam models in four dimensions. Starting from the canonical framework, we construct an operator P acting on the space of cylindrical functions Cyl($\Gamma$), where $\Gamma$ is ...
Alesci, Emanuele +2 more
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Spin Foam Models with Finite Groups [PDF]
Journal of Gravity, 2013 Spin foam models, loop quantum gravity, and group field theory are discussed as quantum gravity candidate theories and usually involve a continuous Lie group. We advocate here to consider quantum gravity-inspired models with finite groups, firstly as a test bed for the full theory and secondly as a class of new lattice theories possibly featuring an ...
Bahr, Benjamin +2 more
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Multiple Functions of Malpighian Tubules in Insects: A Review
Insects, 2022 The Malpighian Tubules (MTs) are the main excretory organs in most insects. They play a key role in the production of primary urine and osmoregulation, selectively reabsorbing water, ions, and solutes.
Priscilla Farina +2 more
doaj +1 more source
, 2014 The spin foam framework provides a way to define the dynamics of canonical loop quantum gravity in a spacetime covariant way, by using a path integral over histories of quantum states which can be interpreted as `quantum space-times'. This chapter provides a basic introduction to spin foams aimed principally at beginning graduate students and, where ...
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Spin foam diagrammatics and topological invariance [PDF]
Classical and Quantum Gravity, 2002 20 pages, latex with AMS macros and eps ...
Girelli, Florian +2 more
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Loop quantization from a lattice gauge theory perspective [PDF]
, 2004 We present an interpretation of loop quantization in the framework of lattice gauge theory. Within this context the lack of appropriate notions of effective theories and renormalization group flow exhibit loop quantization as an incomplete framework ...
Zapata, José A.
core +1 more source
An Overview of the Effectiveness of Bicycle Helmet Designs in Impact Testing
Frontiers in Bioengineering and Biotechnology, 2021 Cycling accidents are the leading cause of sports-related head injuries in the US. Conventional bicycle helmets typically consist of polycarbonate shell over Expanded Polystyrene (EPS) foam and are tested with drop tests to evaluate a helmet’s ability to
Javid Abderezaei +5 more
doaj +1 more source
Spin Foams, Refinement Limit, and Renormalization
, 2023 This preprint is to appear as a chapter in "Handbook of Quantum Gravity" (Editors: C. Bambi, L. Modesto and I.L. Shapiro), Springer.
Asante, Seth K. +2 more
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Diffeomorphisms and spin foam models [PDF]
Nuclear Physics B, 2003 19 ...
Freidel, Laurent, Louapre, David
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Spin Foam Vertex Amplitudes on Quantum Computer—Preliminary Results
Universe, 2019 Vertex amplitudes are elementary contributions to the transition amplitudes in the spin foam models of quantum gravity. The purpose of this article is to make the first step towards computing vertex amplitudes with the use of quantum algorithms.
Jakub Mielczarek
doaj +1 more source