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CMB constraints on monodromy inflation at strong coupling

Copeland, Edmund J.; Cunillera, Francesc; Moss, Adam; Padilla, Antonio


Francesc Cunillera

Associate Professor


We carry out a thorough numerical examination of field theory monodromy inflation at strong coupling. We perform an MCMC analysis using a Gaussian likelihood, fitting multiparameter models using CMB constraints on the spectral index and the tensor to scalar ratio. We show that models with uniquely positive Wilson coefficients are ruled out. If there are coefficients that can take on both signs, there can be a cancellation of terms that flattens the potentials and allows one to satisfy current data, and forecasts with strong constraints on the tensor to scalar ratio. Models of field theory monodromy are naturally enhanced to include a mechanism for canceling off radiative corrections to vacuum energy, via vacuum energy sequestering (VES). Although they include a much larger parameter space, we find that a similar numerical examination yields no significant change in the Bayesian evidence for VES enhanced models, with naturalness considerations making them more attractive from a theoretical perspective.


Copeland, E. J., Cunillera, F., Moss, A., & Padilla, A. (2022). CMB constraints on monodromy inflation at strong coupling. Journal of Cosmology and Astroparticle Physics, 2022(09), Article 080.

Journal Article Type Article
Acceptance Date Aug 9, 2022
Online Publication Date Sep 30, 2022
Publication Date Sep 1, 2022
Deposit Date Nov 29, 2022
Publicly Available Date Dec 2, 2022
Journal Journal of Cosmology and Astroparticle Physics
Electronic ISSN 1475-7516
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 2022
Issue 09
Article Number 080
Keywords inflation, physics of the early universe, string theory and cosmology, transplanckian physics
Public URL
Publisher URL


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