Multi-field inflation from single-field models

Martin Bojowald, Suddhasattwa Brahma, Sean Crowe, Ding Ding, Joseph McCracken

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Quantization implies independent degrees of freedom that do not appear in the classical theory, given by fluctuations, correlations, and higher moments of a state. A systematic derivation of the resulting dynamical systems is presented here in a cosmological application for near-Gaussian states of a single-field inflation model. As a consequence, single-field Higgs inflation is made viable observationally by becoming a multi-field model with a specific potential for a fluctuation field interacting with the inflaton expectation value. Crucially, non-adiabatic methods of semiclassical quantum dynamics reveal important phases that can set suitable initial conditions for slow-roll inflation (in combination with the uncertainty relation), and then end inflation after the observationally preferred number of e-folds. New parameters in the interaction potential are derived from properties of the underlying background state, demonstrating how background non-Gaussianity can affect observational features of inflation or, conversely, how observations may be used to understand the quantum state of the inflaton.

Original languageEnglish (US)
Article number047
JournalJournal of Cosmology and Astroparticle Physics
Issue number8
StatePublished - Aug 2021

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics


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