Results 21 to 30 of about 71,268 (259)
The twistor Wilson loop and the amplituhedron
Journal of High Energy Physics, 2018 The amplituhedron provides a beautiful description of perturbative superamplitude integrands in N = 4 $$ \mathcal{N}=4 $$ SYM in terms of purely geometric objects, generalisations of polytopes. On the other hand the Wilson loop in supertwistor space also
Paul Heslop, Alastair Stewart
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Automating scattering amplitudes with chirality flow
European Physical Journal C: Particles and Fields, 2022 Recently we introduced the chirality-flow formalism, a method which builds on the spinor-helicity formalism and is inspired by the color-flow idea in QCD.
Andrew Lifson +2 more
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A General Expression for Symmetry Factors of Feynman Diagrams [PDF]
, 2001 The calculation of the symmetry factor corresponding to a given Feynman diagram is well known to be a tedious problem. We have derived a simple formula for these symmetry factors.
C D Palmer, Kleinert A., M E Carrington
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Feynman diagrams versus Fermi-gas Feynman emulator [PDF]
Nature Physics, 2012 Precise understanding of strongly interacting fermions, from electrons in modern materials to nuclear matter, presents a major goal in modern physics. However, the theoretical description of interacting Fermi systems is usually plagued by the intricate quantum statistics at play.
van Houcke, Kris +9 more
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A steepest descent calculation of RNA pseudoknots [PDF]
, 2002 We enumerate possible topologies of pseudoknots in single-stranded RNA molecules. We use a steepest-descent approximation in the large N matrix field theory, and a Feynman diagram formalism to describe the resulting pseudoknot ...
A. Zee +3 more
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FEYNMAN DIAGRAMS AND DIFFERENTIAL EQUATIONS [PDF]
International Journal of Modern Physics A, 2007 We review in a pedagogical way the method of differential equations for the evaluation of D-dimensionally regulated Feynman integrals. After dealing with the general features of the technique, we discuss its application in the context of one- and two-loop corrections to the photon propagator in QED, by computing the Vacuum Polarization tensor exactly ...
Argeri, Mario, Mastrolia, Pierpaolo
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Journal of High Energy Physics, 2022 Scattering amplitudes in quantum field theories have intricate analytic properties as functions of the energies and momenta of the scattered particles.
Sebastian Mizera, Simon Telen
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Specializations of partial differential equations for Feynman integrals
Nuclear Physics B, 2022 Starting from the Mellin–Barnes integral representation of a Feynman integral depending on a set of kinematic variables zi, we derive a system of partial differential equations w.r.t. new variables xj, which parameterize the differentiable constraints zi=
Vladimir V. Bytev +2 more
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FEYNMAN DIAGRAMS VIA GRAPHICAL CALCULUS [PDF]
Journal of Knot Theory and Its Ramifications, 2002 We use Reshetikhin-Turaev graphical calculus to define Feynman diagrams and prove that asymptotic expansions of Gaussian integrals can be written as a sum over a suitable family of graphs. We discuss how different kinds of interactions give rise to different families of graphs.
FIORENZA, DOMENICO, Riccardo Murri
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Generalized planar Feynman diagrams: collections [PDF]
Journal of High Energy Physics, 2020 Abstract Tree-level Feynman diagrams in a cubic scalar theory can be given a metric such that each edge has a length. The space of metric trees is made out of orthants joined where a tree degenerates. Here we restrict to planar trees since each degeneration of a tree leads to a single planar neighbor.
Francisco Borges, Freddy Cachazo
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