Scale-independent R2 inflation

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

Research output: Contribution to journalArticlepeer-review

28 Downloads (Pure)


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
Issue number12
Early online date11 Dec 2019
Publication statusPublished - 15 Dec 2019


Dive into the research topics of 'Scale-independent R2 inflation'. Together they form a unique fingerprint.

Cite this