Scale-independent R2 inflation

Pedro G. Ferreira, Christopher T. Hill, Johannes Noller, Graham G. Ross

Research output: Contribution to journalArticlepeer-review

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Abstract

Weyl (scale)-invariant theories of scalars and gravity can generate all mass scales spontaneously. In this paper, we study a particularly simple version—scale-invariant R2 gravity—and show that, during an inflationary period, it leads to fluctuations which, for a particular parameter choice, are almost indistinguishable from normal R2 inflation. Current observations place tight constraints on the primary coupling constant of this theory and predict a tensor to scalar ratio, 0.0033 > r > 0.0026, which is testable with the next generation of cosmic microwave background experiments.

Original languageEnglish
Article number123516
Pages (from-to)1-8
Number of pages8
JournalPhysical Review D
Volume100
Issue number12
Early online date11 Dec 2019
DOIs
Publication statusPublished - 15 Dec 2019

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