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dc.contributor.author | Liu L. | |
dc.contributor.author | Prokopec T. | |
dc.contributor.author | Starobinsky A. | |
dc.date.accessioned | 2019-01-22T20:58:52Z | |
dc.date.available | 2019-01-22T20:58:52Z | |
dc.date.issued | 2018 | |
dc.identifier.issn | 2470-0010 | |
dc.identifier.uri | https://dspace.kpfu.ru/xmlui/handle/net/149731 | |
dc.description.abstract | © 2018 American Physical Society. We consider an inflationary model motivated by quantum effects of gravitational and matter fields near the Planck scale. Our Lagrangian is a resummed version of the effective Lagrangian recently obtained by Demmel, Saueressig, and Zanusso [A proper fixed functional for four-dimensional quantum Einstein gravity, J. High Energy Phys. 08 (2015) 113.JHEPFG1029-847910.1007/JHEP08(2015)113] in the context of gravity as an asymptotically safe theory. It represents a refined Starobinsky model, Leff=MP2R/2+(a/2)R2/[1+bln(R/μ2)], where R is the Ricci scalar, a and b are constants, and μ is an energy scale. By implementing the COBE normalization and the Planck constraint on the scalar spectrum, we show that increasing b leads to an increased value of both the scalar spectral index ns and the tensor-to-scalar ratio r. Requiring ns to be consistent with the Planck Collaboration upper limit, we find that r can be as large as r≃0.01, the value possibly measurable by Stage IV CMB ground experiments and certainly from future dedicated space missions. The predicted running of the scalar spectral index α=dns/dln(k) is still of the order -5×10-4 (as in the Starobinsky model), about 1 order of magnitude smaller than the current observational bound. | |
dc.relation.ispartofseries | Physical Review D | |
dc.title | Inflation in an effective gravitational model and asymptotic safety | |
dc.type | Article | |
dc.relation.ispartofseries-issue | 4 | |
dc.relation.ispartofseries-volume | 98 | |
dc.collection | Публикации сотрудников КФУ | |
dc.source.id | SCOPUS24700010-2018-98-4-SID85052644779 |