On higher derivative corrections to the R + R2 inflationary model
ARTIGO
Inglês
Agradecimentos: A.R.R.C. is supported in part by CAPES - Code 001. I.Sh. is grateful to CNPq (grant 303893/2014-1) and FAPEMIG (grant APQ-01205-16) for partial support. F.S. is grateful to CNPq for partial support. A.A.S. is supported by the RSF grant 16-12-10441
Abstract: The R + R-2 model is successful in describing inflation, as it provides an excellent fit to the full set of available observational data. On the other hand, the same model is the simplest extension of general relativity which does not produce higher derivative ghosts and related...
Abstract: The R + R-2 model is successful in describing inflation, as it provides an excellent fit to the full set of available observational data. On the other hand, the same model is the simplest extension of general relativity which does not produce higher derivative ghosts and related instabilities. Long ago, it was proposed to treat all terms which cause higher derivative instabilities as small perturbations that could avoid the presence of ghosts in the spectrum. We put this proposal into practice and consider an explicit example of treating more complicated higher derivative terms as small perturbations over the R + R-2 model by introducing the R square R term into the action. Within the described scheme, it is possible to obtain an upper bound on the coefficient of this non-scale-free sixth-derivative term by mapping the theory into a one-scalar field potential. It is shown that the result differs from treating this term on equal footing with other terms that requires mapping to a two-scalar field model, and in general leads to different observational consequences
COORDENAÇÃO DE APERFEIÇOAMENTO DE PESSOAL DE NÍVEL SUPERIOR - CAPES
001
CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO - CNPQ
303893/2014-1
FUNDAÇÃO DE AMPARO À PESQUISA DO ESTADO DE MINAS GERAIS - FAPEMIG
APQ-01205-16
Aberto
On higher derivative corrections to the R + R2 inflationary model
On higher derivative corrections to the R + R2 inflationary model
Fontes
Journal of cosmology and astroparticle physics N. 12 (Dec., 2018), n. art. 7, p. 1-18 |