Dynamics of entanglement in expanding quantum fields

• Verfasst von: Berges, Jürgen [VerfasserIn]
• Verfasst von: Flörchinger, Stefan [VerfasserIn]
• Verfasst von: Venugopalan, Raju [VerfasserIn]
• Titel: Dynamics of entanglement in expanding quantum fields
• Verf.angabe: Jürgen Berges, Stefan Floerchinger and Raju Venugopalan
• E-Jahr: 2018
• Jahr: April 27, 2018
• Umfang: 45 S.
• Fussnoten: Gesehen am 21.06.2019
• Titel Quelle: Enthalten in: Journal of high energy physics
• Ort Quelle: Berlin : Springer, 1997
• Jahr Quelle: 2018
• Band/Heft Quelle: (2018,4) Artikel-Nummer 145, 45 Seiten
• ISSN Quelle: 1029-8479
• DOI: doi:10.1007/JHEP04(2018)145
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: Conformal Field Theory
• Sach-SW: Field Theories in Lower Dimensions
• Sach-SW: Quark-Gluon Plasma
• K10plus-PPN: 1584877790

Abstract

We develop a functional real-time approach to computing the entanglement between spatial regions for Gaussian states in quantum field theory. The entanglement entropy is characterized in terms of local correlation functions on space-like Cauchy hypersurfaces. The framework is applied to explore an expanding light cone geometry in the particular case of the Schwinger model for quantum electrodynamics in 1+1 space-time dimensions. We observe that the entanglement entropy becomes extensive in rapidity at early times and that the corresponding local reduced density matrix is a thermal density matrix for excitations around a coherent field with a time dependent temperature. Since the Schwinger model successfully describes many features of multiparticle production in e+e− collisions, our results provide an attractive explanation in this framework for the apparent thermal nature of multiparticle production even in the absence of significant final state scattering.