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Chiral perturbation theory [PDF]

Progress in Particle and Nuclear Physics, 1995
The main elements and methods of chiral perturbation theory, the effective field theory of the Standard Model below the scale of spontaneous chiral symmetry breaking, are summarized.
A Pich, Adler S, Altarev I S, Appelquist T, Bell J S, Bernard V, Bernard V, Bernard V, Bijnens J, Bijnens J, Bruno C, Cappiello L, Chivukula R S, Crewther, de Alfaro V, de Rafael E, Di Vecchia P, Di Vecchia P, Donoghue J F, Ecker G, Ecker G, Ecker G, Ecker G, Esposito-Farèse G, Espriu D, Euler E, Euler E, Fajfer S, Fearing H W, Fearing H W, Gasser J, Gasser J, Georgi H, Georgi H, Goity J L, Golden M, Goldstone J, Gunion J F, Holdom B, Jenkins E, Jenkins E, Krause A, Leutwyler H, Leutwyler H, Leutwyler H, Leutwyler H, Leutwyler H, Maltman K, Meißner U-G, Meißner U-G, Meißner U-G, Morozumi T, Neufeld H, Okubo S, Papadimitriou V, Particle Data Group, Pich A, Schwinger J, Shifman M A, Sugawara H, Weinberg S, Weinberg S, Wess J, Witten E   +63 more
core   +12 more sources

Positivity of hexagon perturbation theory

Journal of High Energy Physics, 2018
The hexagon-form-factor program was proposed as a way to compute three-and higher-point correlation functions in N = 4 $$ \mathcal{N}=4 $$ super-symmetric Yang-Mills theory and in the dual AdS5×S5 superstring theory, by exploiting the integrability of ...
Burkhard Eden, Yunfeng Jiang, Marius de Leeuw, Tim Meier, Dennis le Plat, Alessandro Sfondrini   +5 more
doaj   +3 more sources

Computational Protocol to Evaluate Electron-Phonon Interactions Within Density Matrix Perturbation Theory. [PDF]

J Chem Theory Comput, 2022
Yang H, Govoni M, Kundu A, Galli G.
europepmc   +3 more sources

Perturbation-adapted perturbation theory [PDF]

The Journal of Chemical Physics, 2022
A new general approach is introduced for defining an optimum zero-order Hamiltonian for Rayleigh–Schrödinger perturbation theory. Instead of taking the operator directly from a model problem, it is constructed to be a best fit to the exact Hamiltonian within any desired functional form.
openaire   +4 more sources

Dilaton chiral perturbation theory and applications [PDF]

EPJ Web of Conferences, 2022
We review dilaton chiral perturbation theory (dChPT), the effective low-energy theory for the light sector of near-conformal, confining theories. dChPT provides a systematic expansion in both the fermion mass and the distance to the conformal window.
Golterman Maarten, Shamir Yigal
doaj   +1 more source

Perturbation theory with quantum signal processing [PDF]

Quantum, 2023
Perturbation theory is an important technique for reducing computational cost and providing physical insights in simulating quantum systems with classical computers.
Kosuke Mitarai, Kiichiro Toyoizumi, Wataru Mizukami   +2 more
doaj   +1 more source

Flow-oriented perturbation theory

Journal of High Energy Physics, 2023
We introduce a new diagrammatic approach to perturbative quantum field theory, which we call flow-oriented perturbation theory (FOPT). Within it, Feynman graphs are replaced by strongly connected directed graphs (digraphs).
Michael Borinsky, Zeno Capatti, Eric Laenen, Alexandre Salas-Bernárdez   +3 more
doaj   +1 more source

The heuristically-based generalized perturbation theory

EPJ Nuclear Sciences & Technologies, 2021
The generalized perturbation method is described relevant to ratios of bi-linear functionals of the real and adjoint neutron fluxes of critical multiplying systems.
Gandini Augusto
doaj   +1 more source

Screened perturbation theory [PDF]

Physics Letters B, 1997
Talk presented at Eotvos Conference in Science - 1997, Strong and Electroweak Matter '97, 21-25 May 1997, Eger, Hungary, 5 pages, LaTeX, 2 ...
Karsch, Frithjof, Patkos, A., Petreczky, P.   +2 more
openaire   +4 more sources

D-instanton perturbation theory

Journal of High Energy Physics, 2020
D-instanton world-volume theory has open string zero modes describing collective coordinates of the instanton. The usual perturbative amplitudes in the D-instanton background suffer from infra-red divergences due to the presence of these zero modes, and ...
Ashoke Sen
doaj   +1 more source