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Quenched coupling, entangled equilibria, and correlated composite operators: a tale of two O(N) models
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
Stockholm University, Faculty of Science, Department of Physics.
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(English)In: Article in journal (Refereed) Submitted
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URN: urn:nbn:se:su:diva-168939OAI: oai:DiVA.org:su-168939DiVA, id: diva2:1316418
Available from: 2019-05-17 Created: 2019-05-17 Last updated: 2019-05-18Bibliographically approved
In thesis
1. Quenched coupling and thermal behavior in the O(N) vector model
Open this publication in new window or tab >>Quenched coupling and thermal behavior in the O(N) vector model
2019 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Thermalization is an elusive phenomenon in quantum mechanics. Since according to the AdS/CFT correspondence, a thermal state in the boundary CFT is dual to a black hole in the bulk spacetime, thermalization in the CFT is dual to black hole formation in AdS. Thus, understanding quantum thermalization is likely a key component in understanding the information paradox---the contradiction between QFT and general relativity occurring when a black hole seemingly erases the information of whatever went into creating it.

(Apparent) thermalization in QFT can be investigated by imposing a quench, i.e., a sudden change of some parameter of the theory, and subsequently studying the equilibration process. In this thesis we aim to gain understanding of quantum thermalization by investigating the late-time quench dynamics of a simple free field theory, namely the $O(N)$ vector model. Since the theory is integrable, ``true'' thermalization will not occur but an approximate thermalization. We use different probes such as the effective density matrix and the spectral density function to investigate the extent to which the (pure) state ``looks'' thermal and how this deviates from conventional thermality.

Place, publisher, year, edition, pages
Stockholm University, 2019
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Theoretical Physics
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urn:nbn:se:su:diva-168940 (URN)
Available from: 2019-06-11 Created: 2019-05-17 Last updated: 2019-06-11Bibliographically approved

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Engelsöy, JuliusLarana-Aragon, JorgeSundborg, BoThorlacius, Larus
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