Scale-independent R-2 inflation

Journal article

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.

Authors: Ferreira, P; Hill, C; Noller, J; Ross, G

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: American Physical Society
• Journal: Physical Review D
• Volume: 100
• Issue: 12
• Article number: 123516
• Publication date: 2019-12-11
• Acceptance date: 2019-11-06
• DOI: 10.1103/PhysRevD.100.123516
• EISSN: 2470-0029
• ISSN: 2470-0010
• Keywords: FFR