Predictions of quantum gravity in inflationary cosmology: effects of the Weyl-squared term

Damiano Anselmi, Eugenio Bianchi, Marco Piva

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

We derive the predictions of quantum gravity with fakeons on the amplitudes and spectral indices of the scalar and tensor fluctuations in inflationary cosmology. The action is R +R2 plus the Weyl-squared term. The ghost is eliminated by turning it into a fakeon, that is to say a purely virtual particle. We work to the next-to-leading order of the expansion around the de Sitter background. The consistency of the approach puts a lower bound (mχ > mϕ /4) on the mass mχ of the fakeon with respect to the mass mϕ of the inflaton. The tensor-to-scalar ratio r is predicted within less than an order of magnitude (4/2 < N2r <12 to the leading order in the number of e-foldings N). Moreover, the relation r ≃ –8nT is not affected by the Weyl-squared term. No vector and no other scalar/tensor degree of freedom is present.

Original languageEnglish (US)
Article number211
JournalJournal of High Energy Physics
Volume2020
Issue number7
DOIs
StatePublished - Jul 1 2020

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Fingerprint

Dive into the research topics of 'Predictions of quantum gravity in inflationary cosmology: effects of the Weyl-squared term'. Together they form a unique fingerprint.

Cite this