Strong-field QED effects on polarization states in dipole and quadrudipole pulsar emissions

Abstract Highly magnetized neutron stars have quantum refraction effects on pulsar emission due to the non-linearity of the quantum electrodynamics (QED) action. In this paper, we investigate the evolution of the polarization states of pulsar emission under the quantum refraction effects, combined w...

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Main Authors: Dong-Hoon Kim, Chul Min Kim, Sang Pyo Kim
Format: Article
Language:English
Published: SpringerOpen 2024-12-01
Series:European Physical Journal C: Particles and Fields
Online Access:https://doi.org/10.1140/epjc/s10052-024-13662-0
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author Dong-Hoon Kim
Chul Min Kim
Sang Pyo Kim
author_facet Dong-Hoon Kim
Chul Min Kim
Sang Pyo Kim
author_sort Dong-Hoon Kim
collection DOAJ
description Abstract Highly magnetized neutron stars have quantum refraction effects on pulsar emission due to the non-linearity of the quantum electrodynamics (QED) action. In this paper, we investigate the evolution of the polarization states of pulsar emission under the quantum refraction effects, combined with the dependence on the emission frequency, for dipole and quadrudipole pulsar models; we solve a system of evolution equations of the Stokes vector, where the birefringent vector, in which such effects are encoded, acts on the Stokes vector. At a fixed emission frequency, depending on the magnitude of the birefringent vector, dominated mostly by the magnetic field strength, the evolution of the Stokes vector largely exhibits three different patterns: (i) monotonic, or (ii) half-oscillatory, or (iii) highly oscillatory behaviors. These features are understood and confirmed by means of approximate analytical solutions to the evolution equations. Also, the evolution patterns are shown to differ between dipole and quadrudipole pulsar models, depending on the magnetic field strength.
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spelling doaj-art-bc86089e05834a198553234193c5e8a52025-02-02T12:39:01ZengSpringerOpenEuropean Physical Journal C: Particles and Fields1434-60522024-12-01841212110.1140/epjc/s10052-024-13662-0Strong-field QED effects on polarization states in dipole and quadrudipole pulsar emissionsDong-Hoon Kim0Chul Min Kim1Sang Pyo Kim2The Research Institute of Basic Science, Seoul National UniversityAdvanced Photonics Research Institute, Gwangju Institute of Science and TechnologyDepartment of Physics, Kunsan National UniversityAbstract Highly magnetized neutron stars have quantum refraction effects on pulsar emission due to the non-linearity of the quantum electrodynamics (QED) action. In this paper, we investigate the evolution of the polarization states of pulsar emission under the quantum refraction effects, combined with the dependence on the emission frequency, for dipole and quadrudipole pulsar models; we solve a system of evolution equations of the Stokes vector, where the birefringent vector, in which such effects are encoded, acts on the Stokes vector. At a fixed emission frequency, depending on the magnitude of the birefringent vector, dominated mostly by the magnetic field strength, the evolution of the Stokes vector largely exhibits three different patterns: (i) monotonic, or (ii) half-oscillatory, or (iii) highly oscillatory behaviors. These features are understood and confirmed by means of approximate analytical solutions to the evolution equations. Also, the evolution patterns are shown to differ between dipole and quadrudipole pulsar models, depending on the magnetic field strength.https://doi.org/10.1140/epjc/s10052-024-13662-0
spellingShingle Dong-Hoon Kim
Chul Min Kim
Sang Pyo Kim
Strong-field QED effects on polarization states in dipole and quadrudipole pulsar emissions
European Physical Journal C: Particles and Fields
title Strong-field QED effects on polarization states in dipole and quadrudipole pulsar emissions
title_full Strong-field QED effects on polarization states in dipole and quadrudipole pulsar emissions
title_fullStr Strong-field QED effects on polarization states in dipole and quadrudipole pulsar emissions
title_full_unstemmed Strong-field QED effects on polarization states in dipole and quadrudipole pulsar emissions
title_short Strong-field QED effects on polarization states in dipole and quadrudipole pulsar emissions
title_sort strong field qed effects on polarization states in dipole and quadrudipole pulsar emissions
url https://doi.org/10.1140/epjc/s10052-024-13662-0
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AT sangpyokim strongfieldqedeffectsonpolarizationstatesindipoleandquadrudipolepulsaremissions