Results 61 to 70 of about 700,670 (248)

Sums over Graphs and Integration over Discrete Groupoids

, 2005
We show that sums over graphs such as appear in the theory of Feynman diagrams can be seen as integrals over discrete groupoids. From this point of view, basic combinatorial formulas of the theory of Feynman diagrams can be interpreted as pull-back or ...
A. Abdesslam, A. Joyal, B. Bakalov, B. Day, C. Itzykson, D. Bessis, D. Fiorenza, Domenico Fiorenza, G.M. Kelly, J.C. Baez, J.F. Adams, M. Polyak, M.M. Kapranov, N.Y. Reshetikhin, R. Brown, R. Oeckl, S. Eilenberg, V.I. Arnautov, V.I. Arnold   +18 more
core   +1 more source

Close Examination of the Ground-State Casimir-Polder Interaction: Time-Ordered Versus Covariant Formalism and Radiative Corrections [PDF]

, 2018
The purpose of this paper is twofold. First, we compare, in detail, the derivation of the Casimir-Polder interaction using time-ordered perturbation theory, to the matching of the scattering amplitude using quantum electrodynamics.
Adhikari C M, Berestestskii V B, C M Adhikari, Craig D P, Jentschura U D, Jentschura U D, Power E A, Salam A, U D Jentschura   +8 more
core   +3 more sources

Atomistic Mechanisms Triggered by Joule Heating Effects in Metallic Cu‐Bi Nanowires for Spintronics

Advanced Materials, EarlyView.
Bi doped metallic Cu nanowires are promising for spintronics thanks to the stabilization of a giant spin Hall effect. However, heat resulting from current injection forces Bi to leave solution, forcing segregation into monoatomic decorations which evolve into coherent crystalline aggregates.
Alejandra Guedeja‐Marrón, Juan Ignacio Beltrán, Matilde Saura‐Múzquiz, Paolo Perna, M. Carmen Muñoz, Lucas Pérez, Maria Varela   +6 more
wiley   +1 more source

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, Malin Sjödahl, Zenny Wettersten   +2 more
doaj   +1 more source

Loop lessons from Wilson loops in N=4 supersymmetric Yang-Mills theory

, 2011
N=4 supersymmetric Yang-Mills theory exhibits a rather surprising duality of Wilson-loop vacuum expectation values and scattering amplitudes. In this paper, we investigate this correspondence at the diagram level.
A Brandhuber, A Brandhuber, A Gorsky, A Gorsky, AI Davydychev, Andrea Banfi, C Anastasiou, C Anastasiou, C Anastasiou, C Anastasiou, Charalampos Anastasiou, EE Boos, F Cachazo, G Kramer, GP Korchemsky, JA Minahan, JB Tausk, JM Drummond, JM Drummond, JM Maldacena, LF Alday, MB Green, N Beisert, N Beisert, T Binoth, V Duca Del, V Duca Del, V Duca Del, Z Bern, Z Bern, Z Bern, Z Bern   +31 more
core   +1 more source

The Nature of Representation in Feynman Diagrams [PDF]

Perspectives in Science, 2017
After a brief presentation of Feynman diagrams, we criticizise the idea that Feynman diagrams can be considered to be pictures or depictions of actual physical processes.
Mauro Dorato, E. Rossanese
semanticscholar   +1 more source

Electronic Structure Reorganization in MPS3 via d‐Shell‐Selective Alkali Metal Doping

Advanced Science, EarlyView.
Alkali metal doping of layered MPS3 antiferromagnets reveals d‐shell‐selective responses. While MnPS3 resists charge transfer due to its half‐filled 3d5 shell, FePS3 and NiPS3 behave similarly to CoPS3 by accommodating extra d‐electrons. Yet only CoPS3, with its least stable d‐shell, undergoes pronounced band restructuring and a semiconducting‐to ...
Jonah Elias Nitschke, Preeti Bhumla, Till Willershausen, Patrick Merisescu, David Maximilian Janas, Lasse Sternemann, Michael Gutnikov, Karl Schiller, Valentin Mischke, Michele Capra, Mira Sophie Arndt, Silvana Botti, Mirko Cinchetti   +12 more
wiley   +1 more source

A Perspective on Interactive Theorem Provers in Physics

Advanced Science, EarlyView.
Into an interactive theorem provers (ITPs), one can write mathematical definitions, theorems and proofs, and the correctness of those results is automatically checked. This perspective goes over the best usage of ITPs within physics and motivates the open‐source community run project PhysLean, the aim of which is to be a library for digitalized physics
Joseph Tooby‐Smith
wiley   +1 more source

The Higgs mechanism with diagrams: A didactic approach

SciPost Physics Lecture Notes
We present a paedagogical treatment of the electroweak Higgs mechanism based solely on Feynman diagrams and S-matrix elements, without recourse to (gauge) symmetry arguments. Throughout, the emphasis is on Feynman rules and the Schwinger-Dyson equations;
Jochem Kip, Ronald Kleiss
doaj   +1 more source

Generating a nonperturbative mass gap using Feynman diagrams in an asymptotically free theory [PDF]

, 2017
Using the example of a two dimensional four-fermion lattice field theory we demonstrate that Feynman diagrams can generate a mass gap when massless fermions interact via a marginally relevant coupling.
V. Ayyar, S. Chandrasekharan
semanticscholar   +1 more source