<div class="csl-bib-body">
<div class="csl-entry">Käding, C., & Pitschmann, M. (2022). Density Matrix Formalism for Interacting Quantum Fields. <i>Universe</i>, <i>8</i>(11), Article 601. https://doi.org/10.3390/universe8110601</div>
</div>
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dc.identifier.issn
2218-1997
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dc.identifier.uri
http://hdl.handle.net/20.500.12708/139475
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dc.description.abstract
We provide a description of interacting quantum fields in terms of density matrices for any occupation numbers in Fock space in a momentum basis. As a simple example, we focus on a real scalar field interacting with another real scalar field, and present a practicable formalism for directly computing the density matrix elements of the combined scalar–scalar system. For deriving the main formula, we use techniques from non-equilibrium quantum field theory like thermo-field dynamics and the Schwinger–Keldysh formalism. Our results allow for studies of particle creation/annihilation processes at finite times and other non-equilibrium processes, including those found in the theory of open quantum systems.
en
dc.language.iso
en
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dc.publisher
MDPI
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dc.relation.ispartof
Universe
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dc.subject
density matrix
en
dc.subject
quantum field theory
en
dc.subject
quantum systems
en
dc.subject
path integrals
en
dc.title
Density Matrix Formalism for Interacting Quantum Fields
en
dc.type
Article
en
dc.type
Artikel
de
dcterms.dateSubmitted
2022-10-13
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dc.type.category
Original Research Article
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tuw.container.volume
8
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tuw.container.issue
11
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tuw.journal.peerreviewed
true
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tuw.peerreviewed
true
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tuw.researchTopic.id
Q6
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tuw.researchTopic.id
X1
-
tuw.researchTopic.id
A3
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tuw.researchTopic.name
Quantum Many-body Systems Physics
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tuw.researchTopic.name
Beyond TUW-research foci
-
tuw.researchTopic.name
Fundamental Mathematics Research
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tuw.researchTopic.value
30
-
tuw.researchTopic.value
50
-
tuw.researchTopic.value
20
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dcterms.isPartOf.title
Universe
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tuw.publication.orgunit
E141 - Atominstitut
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tuw.publisher.doi
10.3390/universe8110601
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dc.identifier.articleid
601
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dc.identifier.eissn
2218-1997
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dc.description.numberOfPages
16
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tuw.author.orcid
0000-0002-1781-2609
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tuw.author.orcid
0000-0003-2721-4589
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wb.sci
true
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wb.sciencebranch
Physik, Astronomie
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wb.sciencebranch.oefos
1030
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wb.sciencebranch.value
100
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Article
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item.openairetype
Artikel
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none
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Publications
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Publications
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item.languageiso639-1
en
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item.openairecristype
http://purl.org/coar/resource_type/c_18cf
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item.openairecristype
http://purl.org/coar/resource_type/c_18cf
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item.fulltext
no Fulltext
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crisitem.author.dept
E141-04 - Forschungsbereich Neutron- and Quantum Physics
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crisitem.author.dept
E141-04 - Forschungsbereich Neutron- and Quantum Physics