Production of primordial gravitational waves in a simple class of running vacuum cosmologies

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dc.contributor.authorTamayo, D. A.
dc.contributor.authorLima, J. A. S.
dc.contributor.authorBessada, D. F. A. [UNIFESP]
dc.date.accessioned2019-08-19T11:50:10Z
dc.date.available2019-08-19T11:50:10Z
dc.date.issued2017
dc.description.abstractThe problem of cosmological production of gravitational waves (GWs) is discussed in the framework of an expanding, spatially homogeneous and isotropic FRW type universe with time-evolving vacuum energy density. The GW equation is established and its modified time-dependent part is analytically resolved for different epochs in the case of a flat geometry. Unlike the standard Lambda CDM cosmology (no interacting vacuum), we show that GWs are produced in the radiation era even in the context of general relativity. We also show that for all values of the free parameter, the high frequency modes are damped out even faster than in the standard cosmology both in the radiation and matter-vacuum dominated epoch. The formation of the stochastic background of gravitons and the remnant power spectrum generated at different cosmological eras are also explicitly evaluated. It is argued that measurements of the CMB polarization (B-modes) and its comparison with the rigid Lambda CDM model plus the inflationary paradigm may become a crucial test for dynamical dark energy models in the near future.en
dc.description.affiliationUniv São Paulo, Inst Fis, Rua Matao 187, BR-05508090 São Paulo, SP, Brazil
dc.description.affiliationUniv São Paulo, Dept Astron, Rua Matao 1226, BR-05508900 São Paulo, Brazil
dc.description.affiliationUniv Fed São Paulo UNIFESP, Lab Fis Teor & Comp Cient, Campus Diadema, São Paulo, Brazil
dc.description.affiliationUnifespUniv Fed São Paulo UNIFESP, Lab Fis Teor & Comp Cient, Campus Diadema, São Paulo, Brazil
dc.description.sourceWeb of Science
dc.format.extent-
dc.identifierhttp://dx.doi.org/10.1142/S0218271817500936
dc.identifier.citationInternational Journal Of Modern Physics D. Singapore, v. 26, n. 9, p. -, 2017.
dc.identifier.doi10.1142/S0218271817500936
dc.identifier.issn0218-2718
dc.identifier.urihttp://repositorio.unifesp.br/handle/11600/51484
dc.identifier.wosWOS:000405693100008
dc.language.isoeng
dc.publisherWorld Scientific Publ Co Pte Ltd
dc.rightsinfo:eu-repo/semantics/restrictedAccess
dc.subjectCosmologyen
dc.subjectdecaying vacuumen
dc.subjectgravitational wavesen
dc.titleProduction of primordial gravitational waves in a simple class of running vacuum cosmologiesen
dc.typeinfo:eu-repo/semantics/article
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