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 |
|