Propagator from nonperturbative worldline dynamics

We use the worldline representation for correlation functions together with numerical path integral methods to extract nonperturbative information about the propagator to all orders in the coupling in the quenched limit (small-N<sub>f</sub> expansion). Specifically, we consider a simple...

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Autores principales: Franchino Viñas, Sebastián Alberto, Gies, Holger
Formato: Articulo
Lenguaje:Inglés
Publicado: 2019
Materias:
Ciencias Exactas
Física
Nonperturbative effects in field theory
Quantum electrodynamics
Path-integral Monte Carlo
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/130420
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-130420
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Física
Nonperturbative effects in field theory
Quantum electrodynamics
Path-integral Monte Carlo
spellingShingle Ciencias Exactas
Física
Nonperturbative effects in field theory
Quantum electrodynamics
Path-integral Monte Carlo
Franchino Viñas, Sebastián Alberto
Gies, Holger
Propagator from nonperturbative worldline dynamics
topic_facet Ciencias Exactas
Física
Nonperturbative effects in field theory
Quantum electrodynamics
Path-integral Monte Carlo
description We use the worldline representation for correlation functions together with numerical path integral methods to extract nonperturbative information about the propagator to all orders in the coupling in the quenched limit (small-N<sub>f</sub> expansion). Specifically, we consider a simple two-scalar field theory with cubic interaction (S²QED) in four dimensions as a toy model for QED-like theories. Using a worldline regularization technique, we are able to analyze the divergence structure of all-order diagrams and to perform the renormalization of the model nonperturbatively. Our method gives us access to a wide range of couplings and coordinate distances. We compute the pole mass of the S²QED electron and observe sizable nonperturbative effects in the strong-coupling regime arising from the full photon dressing. We also find indications for the existence of a critical coupling where the photon dressing compensates the bare mass such that the electron mass vanishes. The short distance behavior remains unaffected by the photon dressing in accordance with the power-counting structure of the model.
format Articulo
Articulo
author Franchino Viñas, Sebastián Alberto
Gies, Holger
author_facet Franchino Viñas, Sebastián Alberto
Gies, Holger
author_sort Franchino Viñas, Sebastián Alberto
title Propagator from nonperturbative worldline dynamics
title_short Propagator from nonperturbative worldline dynamics
title_full Propagator from nonperturbative worldline dynamics
title_fullStr Propagator from nonperturbative worldline dynamics
title_full_unstemmed Propagator from nonperturbative worldline dynamics
title_sort propagator from nonperturbative worldline dynamics
publishDate 2019
url http://sedici.unlp.edu.ar/handle/10915/130420
work_keys_str_mv AT franchinovinassebastianalberto propagatorfromnonperturbativeworldlinedynamics
AT giesholger propagatorfromnonperturbativeworldlinedynamics
bdutipo_str Repositorios
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