Infrared-safe scattering without photon vacuum transitions and time-dependent decoherence

Abstract Scattering in 3 + 1-dimensional QED is believed to give rise to transitions between different photon vacua. We show that these transitions can be removed by taking into account off-shell modes which correspond to Liénard-Wiechert fields of asymptotic states. This makes it possible to formul...

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Autor principal:	Dominik Neuenfeld
Formato:	article
Lenguaje:	EN
Publicado:	SpringerOpen 2021
Materias:	Gauge Symmetry Scattering Amplitudes Nuclear and particle physics. Atomic energy. Radioactivity QC770-798
Acceso en línea:	https://doaj.org/article/f3fa514c4e2a43e496ca4f4afca7d0ea
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spelling	oai:doaj.org-article:f3fa514c4e2a43e496ca4f4afca7d0ea2021-11-28T12:40:26ZInfrared-safe scattering without photon vacuum transitions and time-dependent decoherence10.1007/JHEP11(2021)1891029-8479https://doaj.org/article/f3fa514c4e2a43e496ca4f4afca7d0ea2021-11-01T00:00:00Zhttps://doi.org/10.1007/JHEP11(2021)189https://doaj.org/toc/1029-8479Abstract Scattering in 3 + 1-dimensional QED is believed to give rise to transitions between different photon vacua. We show that these transitions can be removed by taking into account off-shell modes which correspond to Liénard-Wiechert fields of asymptotic states. This makes it possible to formulate scattering in 3 + 1-dimensional QED on a Hilbert space which furnishes a single representation of the canonical commutation relations (CCR). Different QED selection sectors correspond to inequivalent representations of the photon CCR and are stable under the action of an IR finite, unitary S-matrix. Infrared divergences are cancelled by IR radiation. Using this formalism, we discuss the time-dependence of decoherence and phases of out-going density matrix elements in the presence of classical currents. The results demonstrate that although no information about a scattering process is stored in strictly zero-energy modes of the photon field, entanglement between charged matter and low energy modes increases over time.Dominik NeuenfeldSpringerOpenarticleGauge SymmetryScattering AmplitudesNuclear and particle physics. Atomic energy. RadioactivityQC770-798ENJournal of High Energy Physics, Vol 2021, Iss 11, Pp 1-26 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Gauge Symmetry Scattering Amplitudes Nuclear and particle physics. Atomic energy. Radioactivity QC770-798
spellingShingle	Gauge Symmetry Scattering Amplitudes Nuclear and particle physics. Atomic energy. Radioactivity QC770-798 Dominik Neuenfeld Infrared-safe scattering without photon vacuum transitions and time-dependent decoherence
description	Abstract Scattering in 3 + 1-dimensional QED is believed to give rise to transitions between different photon vacua. We show that these transitions can be removed by taking into account off-shell modes which correspond to Liénard-Wiechert fields of asymptotic states. This makes it possible to formulate scattering in 3 + 1-dimensional QED on a Hilbert space which furnishes a single representation of the canonical commutation relations (CCR). Different QED selection sectors correspond to inequivalent representations of the photon CCR and are stable under the action of an IR finite, unitary S-matrix. Infrared divergences are cancelled by IR radiation. Using this formalism, we discuss the time-dependence of decoherence and phases of out-going density matrix elements in the presence of classical currents. The results demonstrate that although no information about a scattering process is stored in strictly zero-energy modes of the photon field, entanglement between charged matter and low energy modes increases over time.
format	article
author	Dominik Neuenfeld
author_facet	Dominik Neuenfeld
author_sort	Dominik Neuenfeld
title	Infrared-safe scattering without photon vacuum transitions and time-dependent decoherence
title_short	Infrared-safe scattering without photon vacuum transitions and time-dependent decoherence
title_full	Infrared-safe scattering without photon vacuum transitions and time-dependent decoherence
title_fullStr	Infrared-safe scattering without photon vacuum transitions and time-dependent decoherence
title_full_unstemmed	Infrared-safe scattering without photon vacuum transitions and time-dependent decoherence
title_sort	infrared-safe scattering without photon vacuum transitions and time-dependent decoherence
publisher	SpringerOpen
publishDate	2021
url	https://doaj.org/article/f3fa514c4e2a43e496ca4f4afca7d0ea
work_keys_str_mv	AT dominikneuenfeld infraredsafescatteringwithoutphotonvacuumtransitionsandtimedependentdecoherence
_version_	1718407868264218624

Infrared-safe scattering without photon vacuum transitions and time-dependent decoherence

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