Non-minimally coupled Natural Inflation: Palatini and Metric formalism with the recent BICEP/Keck
N. Bostan
Abstract
Abstract In this work, we show the effect of the non-minimal coupling ξϕ 2 R on the inflationary parameters by considering the single-field inflation and present the inflationary predictions of the appealing potential for the particle physics viewpoint: Natural Inflation, an axion-like inflaton which has a cosine-type periodic potential and the inflaton naturally emerges as a pseudo-Nambu-Goldstone boson with a spontaneously broken global symmetry. We present the inflationary predictions for this potential, n s , r , and α = d n s /d ln k . In addition, we assume standard thermal history after inflation, and using this, for considered potential, we show compatible regions for the n s , r within the recent BICEP/Keck results.
Topics & Concepts
InflatonPhysicsGoldstone bosonAxionInflation (cosmology)BosonParticle physicsTheoretical physicsSymmetry breakingPhysics beyond the Standard ModelMathematical physicsDark matterCosmology and Gravitation TheoriesBlack Holes and Theoretical PhysicsDark Matter and Cosmic Phenomena