f (R) gravity with broken Weyl gauge symmetry, cosmological backreaction, and its effects on CMB anisotropy
DC Field | Value | Language |
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dc.contributor.author | Park, Jiwon | - |
dc.contributor.author | Lee, Tae Hoon | - |
dc.date.accessioned | 2023-10-04T08:40:04Z | - |
dc.date.available | 2023-10-04T08:40:04Z | - |
dc.date.created | 2023-10-04 | - |
dc.date.issued | 2023-12 | - |
dc.identifier.issn | 2212-6864 | - |
dc.identifier.uri | https://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/44342 | - |
dc.description.abstract | We propose a new class of f (R) theory where its Weyl gauge symmetry is broken in the primordial era of the universe. This symmetry forces one to adopt a new scalar field, namely a Weyl field and a gauge vector boson. Furthermore, an equivalent form of the Einstein-Hilbert Lagrangian with a nonminimally coupled scalar field corresponding to the function f (R) is found. Due to the geometrical feature of the Weyl field, it turns out that the symmetry breaking induces a non-minimal coupling, which cannot be expected in the standard f (R) theories. We explain how this affects the evolution of the universe at cosmological scales. It is shown that there may be a value shift in the Planck constant and the cosmological constant. This can be regarded as a genuine exemplification of the cosmological backreaction. Furthermore, one also finds new features in the evolution of perturbational variables and cosmic microwave background anisotropy. Moreover, we prove that when a specific f (R) model invokes inflation, the amplitude of the primordial gravitational waves affects the evolution of scalar perturbation due to the new non-minimal coupling. As a case study, we explain how this can be embodied in the Starobinsky inflation. Finally, we discuss some impacts that this physics can bear and the possibility of giving a new restriction of the estimation of cosmological variables such as the gravitational wave amplitude with experiments. | - |
dc.language | 영어 | - |
dc.language.iso | en | - |
dc.publisher | ELSEVIER | - |
dc.relation.isPartOf | PHYSICS OF THE DARK UNIVERSE | - |
dc.title | f (R) gravity with broken Weyl gauge symmetry, cosmological backreaction, and its effects on CMB anisotropy | - |
dc.type | Article | - |
dc.identifier.doi | 10.1016/j.dark.2023.101264 | - |
dc.type.rims | ART | - |
dc.identifier.bibliographicCitation | PHYSICS OF THE DARK UNIVERSE, v.42 | - |
dc.description.journalClass | 1 | - |
dc.identifier.wosid | 001055293400001 | - |
dc.identifier.scopusid | 2-s2.0-85162264884 | - |
dc.citation.title | PHYSICS OF THE DARK UNIVERSE | - |
dc.citation.volume | 42 | - |
dc.contributor.affiliatedAuthor | Lee, Tae Hoon | - |
dc.identifier.url | https://linkinghub.elsevier.com/retrieve/pii/S2212686423000985 | - |
dc.type.docType | Article | - |
dc.description.isOpenAccess | Y | - |
dc.subject.keywordAuthor | Cosmological backreaction | - |
dc.subject.keywordAuthor | Cosmic acceleration | - |
dc.subject.keywordAuthor | Primordial gravitational waves | - |
dc.subject.keywordAuthor | CMB anisotropy | - |
dc.subject.keywordAuthor | f(R) theory of gravity | - |
dc.subject.keywordPlus | BREAKING | - |
dc.relation.journalResearchArea | Astronomy & Astrophysics | - |
dc.relation.journalWebOfScienceCategory | Astronomy & Astrophysics | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
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