Density fluctuations and single-mode thermal states in the FRW universe
Using single-mode squeezed and coherent thermal states formalism, we analyzed the validity of the semiclassical Einstein equation (SCEE) in the flat Friedmann–Robertson–Walker universe by analyzing the density fluctuations in terms of a massive inflaton. In a single-mode squeezed thermal states the...
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| Veröffentlicht in: | European physical journal plus 2020-04, Vol.135 (4), p.360, Article 360 |
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| creator | Dhayal, Renu Rathore, Meghna Kambila, Vijay Kumar Venkataratnam, K. K. |
| description | Using single-mode squeezed and coherent thermal states formalism, we analyzed the validity of the semiclassical Einstein equation (SCEE) in the flat Friedmann–Robertson–Walker universe by analyzing the density fluctuations in terms of a massive inflaton. In a single-mode squeezed thermal states the density fluctuations are too large; consequently, the semiclassical theory of gravity (SCTG) does not hold good, for squeezing parameter greater than unity, i.e.,
r
s
>
1
; however, the theory is valid when this related squeezing parameter is smaller than the unity, i.e.,
r
s
<
<
1
and
r
s
<
1
. Also, it is noted that the SCEE is dependable on coherent thermal state formalism. The current study provides a description of the density fluctuations as a result of the quantum and thermal effects in the SCTG. |
| doi_str_mv | 10.1140/epjp/s13360-020-00362-3 |
| format | Article |
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r
s
>
1
; however, the theory is valid when this related squeezing parameter is smaller than the unity, i.e.,
r
s
<
<
1
and
r
s
<
1
. Also, it is noted that the SCEE is dependable on coherent thermal state formalism. The current study provides a description of the density fluctuations as a result of the quantum and thermal effects in the SCTG.</description><identifier>ISSN: 2190-5444</identifier><identifier>EISSN: 2190-5444</identifier><identifier>DOI: 10.1140/epjp/s13360-020-00362-3</identifier><language>eng</language><publisher>Berlin/Heidelberg: Springer Berlin Heidelberg</publisher><subject>Applied and Technical Physics ; Atomic ; Complex Systems ; Compressing ; Condensed Matter Physics ; Cosmology ; Density ; Einstein equations ; Fluctuations ; Formalism ; Gravitation theory ; Gravity ; Mathematical and Computational Physics ; Molecular ; Optical and Plasma Physics ; Parameters ; Physics ; Physics and Astronomy ; Quantum field theory ; Regular Article ; Temperature effects ; Theoretical ; Unity ; Universe ; Validity</subject><ispartof>European physical journal plus, 2020-04, Vol.135 (4), p.360, Article 360</ispartof><rights>Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2020</rights><rights>Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2020.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c334t-4b93542c92874b45b0fad331ba80e99c56293139ac0e2518e0db4e17772273593</citedby><cites>FETCH-LOGICAL-c334t-4b93542c92874b45b0fad331ba80e99c56293139ac0e2518e0db4e17772273593</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1140/epjp/s13360-020-00362-3$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://www.proquest.com/docview/2920384770?pq-origsite=primo$$EHTML$$P50$$Gproquest$$H</linktohtml><link.rule.ids>314,780,784,21388,27924,27925,33744,41488,42557,43805,51319,64385,64389,72469</link.rule.ids></links><search><creatorcontrib>Dhayal, Renu</creatorcontrib><creatorcontrib>Rathore, Meghna</creatorcontrib><creatorcontrib>Kambila, Vijay Kumar</creatorcontrib><creatorcontrib>Venkataratnam, K. K.</creatorcontrib><title>Density fluctuations and single-mode thermal states in the FRW universe</title><title>European physical journal plus</title><addtitle>Eur. Phys. J. Plus</addtitle><description>Using single-mode squeezed and coherent thermal states formalism, we analyzed the validity of the semiclassical Einstein equation (SCEE) in the flat Friedmann–Robertson–Walker universe by analyzing the density fluctuations in terms of a massive inflaton. In a single-mode squeezed thermal states the density fluctuations are too large; consequently, the semiclassical theory of gravity (SCTG) does not hold good, for squeezing parameter greater than unity, i.e.,
r
s
>
1
; however, the theory is valid when this related squeezing parameter is smaller than the unity, i.e.,
r
s
<
<
1
and
r
s
<
1
. Also, it is noted that the SCEE is dependable on coherent thermal state formalism. 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K.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c334t-4b93542c92874b45b0fad331ba80e99c56293139ac0e2518e0db4e17772273593</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Applied and Technical Physics</topic><topic>Atomic</topic><topic>Complex Systems</topic><topic>Compressing</topic><topic>Condensed Matter Physics</topic><topic>Cosmology</topic><topic>Density</topic><topic>Einstein equations</topic><topic>Fluctuations</topic><topic>Formalism</topic><topic>Gravitation theory</topic><topic>Gravity</topic><topic>Mathematical and Computational Physics</topic><topic>Molecular</topic><topic>Optical and Plasma Physics</topic><topic>Parameters</topic><topic>Physics</topic><topic>Physics and Astronomy</topic><topic>Quantum field theory</topic><topic>Regular Article</topic><topic>Temperature effects</topic><topic>Theoretical</topic><topic>Unity</topic><topic>Universe</topic><topic>Validity</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Dhayal, Renu</creatorcontrib><creatorcontrib>Rathore, Meghna</creatorcontrib><creatorcontrib>Kambila, Vijay Kumar</creatorcontrib><creatorcontrib>Venkataratnam, K. 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r
s
>
1
; however, the theory is valid when this related squeezing parameter is smaller than the unity, i.e.,
r
s
<
<
1
and
r
s
<
1
. Also, it is noted that the SCEE is dependable on coherent thermal state formalism. The current study provides a description of the density fluctuations as a result of the quantum and thermal effects in the SCTG.</abstract><cop>Berlin/Heidelberg</cop><pub>Springer Berlin Heidelberg</pub><doi>10.1140/epjp/s13360-020-00362-3</doi></addata></record> |
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| subjects | Applied and Technical Physics Atomic Complex Systems Compressing Condensed Matter Physics Cosmology Density Einstein equations Fluctuations Formalism Gravitation theory Gravity Mathematical and Computational Physics Molecular Optical and Plasma Physics Parameters Physics Physics and Astronomy Quantum field theory Regular Article Temperature effects Theoretical Unity Universe Validity |
| title | Density fluctuations and single-mode thermal states in the FRW universe |
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