Universal attractor for inflation at strong coupling.
We introduce a novel nonminimal coupling between gravity and the inflaton sector. Remarkably, for large values of this coupling all models asymptote to a universal attractor. This behavior is independent of the original scalar potential and generalizes the attractor in the φ4 theory with nonminimal coupling to gravity. The attractor is located in the "sweet spot" of parameter values that are preferred by Planck's recent results.
Department of Physics and SITP, Stanford University, Stanford, California 94305, USA.
Renata
R
Kallosh
Department of Physics and SITP, Stanford University, Stanford, California 94305, USA.
Andrei
A
Linde
Centre for Theoretical Physics, University of Groningen, Nijenborgh 4, 9747 AG Groningen, Netherlands.
Diederik
D
Roest