TY - JOUR
T1 - Multi-field inflation from single-field models
AU - Bojowald, Martin
AU - Brahma, Suddhasattwa
AU - Crowe, Sean
AU - Ding, Ding
AU - McCracken, Joseph
N1 - Funding Information:
This work was supported in part by NSF grant PHY-1912168. SB is supported in part by the NSERC (funding reference #CITA 490888-16) through a CITA National Fellowship and by a McGill Space Institute fellowship. SC is supported by the Sonata Bis Grant No. DEC-2017/26/E/ST2/00763 of the National Science Centre Poland.
Publisher Copyright:
© 2021 IOP Publishing Ltd and Sissa Medialab.
PY - 2021/8
Y1 - 2021/8
N2 - 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.
AB - 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.
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U2 - 10.1088/1475-7516/2021/08/047
DO - 10.1088/1475-7516/2021/08/047
M3 - Article
AN - SCOPUS:85114694518
VL - 2021
JO - Journal of Cosmology and Astroparticle Physics
JF - Journal of Cosmology and Astroparticle Physics
SN - 1475-7516
IS - 8
M1 - 047
ER -