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Quenched coupling, entangled equilibria, and correlated composite operators: a tale of two O(N) models
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Physics.
Stockholm Univ, Oskar Klein Ctr Cosmoparticle Phys, S-10691 Stockholm, Sweden;Stockholm Univ, Dept Phys, AlbaNova, S-10691 Stockholm, Sweden.
Stockholm Univ, Oskar Klein Ctr Cosmoparticle Phys, S-10691 Stockholm, Sweden;Stockholm Univ, Dept Phys, AlbaNova, S-10691 Stockholm, Sweden.
Stockholm Univ, Oskar Klein Ctr Cosmoparticle Phys, S-10691 Stockholm, Sweden;Stockholm Univ, Dept Phys, AlbaNova, S-10691 Stockholm, Sweden.
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2019 (English)In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 8, article id 139Article in journal (Refereed) Published
Abstract [en]

A macroscopic version of Einstein-Podolsky-Rosen entanglement is obtained by quenching a quadratic coupling between two O(N) vector models. A quench of the mixed vacuum produces an excited entangled state, reminiscent of purified thermal equilibrium, whose properties can be studied analytically in the free limit of the individual field theories. The decoupling of different wavelength modes in free field theory prevents true thermalisation but a more subtle difference is that the density operator obtained by a partial trace does not commute with the post-quench Hamiltonian. Generalized thermal behaviour is obtained at late times, in the limit of weak initial mixing or a smooth but rapid quench. More surprisingly, late-time correlation functions of composite operators in the post-quench free field theory share interesting properties with correlators in strongly coupled systems. We propose a holographic interpretation of our result.

Place, publisher, year, edition, pages
2019. no 8, article id 139
Keywords [en]
AdS-CFT Correspondence, Effective Field Theories, Holography and condensed matter physics (AdS/CMT)
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-394266DOI: 10.1007/JHEP08(2019)139ISI: 000483943900002OAI: oai:DiVA.org:uu-394266DiVA, id: diva2:1359433
Funder
Swedish Research Council, DNR-2018-03803Knut and Alice Wallenberg Foundation, 113410212Available from: 2019-10-09 Created: 2019-10-09 Last updated: 2019-10-09Bibliographically approved

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