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dc.contributor.author
Brahma, Suddhasattwa
dc.contributor.author
Alaryani, Omar
dc.contributor.author
Brandenberger, Robert
dc.date.accessioned
2020-09-14T09:10:03Z
dc.date.available
2020-09-13T04:37:51Z
dc.date.available
2020-09-14T09:10:03Z
dc.date.issued
2020-08-15
dc.identifier.issn
1550-7998
dc.identifier.issn
0556-2821
dc.identifier.issn
1550-2368
dc.identifier.other
10.1103/PhysRevD.102.043529
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/440175
dc.identifier.doi
10.3929/ethz-b-000440175
dc.description.abstract
We show that the entropy of cosmological perturbations originating as quantum vacuum fluctuations in the very early universe, including the contribution of the leading nonlinear interactions, can be viewed as momentum space entanglement entropy between sub- and super-Hubble modes. The interactions between these modes cause decoherence of the super-Hubble fluctuations which, in turn, leads to a nonvanishing entropy of the reduced density matrix corresponding to the super-Hubble inhomogeneities. In particular, applying this to inflationary cosmology reveals that the entanglement entropy produced by leading order nonlinearities dominates over that coming from the squeezing of the vacuum state unless inflation lasts for a very short period. Furthermore, demanding that this entanglement entropy be smaller than the thermal entropy at the beginning of the radiation phase of standard cosmology leads to an upper bound on the duration of inflation which is similar to what is obtained from the trans-Planckian censorship conjecture.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
American Physical Society
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.title
Entanglement entropy of cosmological perturbations
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
dc.date.published
2020-08-31
ethz.journal.title
Physical Review D
ethz.journal.volume
102
en_US
ethz.journal.issue
4
en_US
ethz.journal.abbreviated
Phys. rev. D.
ethz.pages.start
043529
en_US
ethz.size
20 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Ridge, NY
en_US
ethz.publication.status
published
en_US
ethz.date.deposited
2020-09-13T04:37:56Z
ethz.source
WOS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2020-09-14T09:10:14Z
ethz.rosetta.lastUpdated
2021-02-15T17:12:47Z
ethz.rosetta.versionExported
true
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