• Open Access

General double monodromy inflation

Guido D’Amico, Nemanja Kaloper, and Alexander Westphal
Phys. Rev. D 105, 103527 – Published 19 May 2022

Abstract

We revisit the roller-coaster cosmology based on multiple stages of monodromy inflation. Working within the framework of effective flux monodromy field theory, we include the full range of strong coupling corrections to the inflaton sector. We find that flattened potentials Vϕp+ with p1/2, limited to N2540 e-folds in the first stage of inflation, continue to fit the cosmic microwave background. They yield 0.96ns0.97 and produce relic gravity waves with 0.006r0.035, in full agreement with the most recent bounds from BICEP/Keck. The nonlinear derivative corrections generated by strong dynamics in effective field theory (EFT) also lead to equilateral non-Gaussianity fNLeqO(1)O(10), close to the current observational bounds. Finally, in the multistage roller coaster, an inflaton–hidden sector U(1) coupling can produce a tachyonic chiral vector background, which converts rapidly into tensors during the short interruption by matter domination. The produced stochastic gravity waves are chiral, and so they may be clearly identifiable by gravity wave instruments like LISA, Big Bang Observer, Einstein Telescope, NANOgrav, or SKA, depending on the precise model realization. We also point out that the current attempts to resolve the H0 tension using early dark energy generically raise ns. This might significantly alter the impact of BICEP/Keck data on models of inflation.

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  • Received 31 January 2022
  • Accepted 8 April 2022

DOI:https://doi.org/10.1103/PhysRevD.105.103527

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Gravitation, Cosmology & Astrophysics

Authors & Affiliations

Guido D’Amico1,2,*, Nemanja Kaloper3,†, and Alexander Westphal4,‡

  • 1Department of Mathematical, Physical and Computer Sciences, University of Parma, 43124 Parma, Italy
  • 2INFN Gruppo Collegato di Parma, 43124 Parma, Italy
  • 3QMAP, Department of Physics and Astronomy, University of California Davis, California 95616, USA
  • 4Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, D-22607 Hamburg, Germany

  • *damico.guido@gmail.com
  • kaloper@physics.ucdavis.edu
  • alexander.westphal@desy.de

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Issue

Vol. 105, Iss. 10 — 15 May 2022

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