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Complex Field Inflation
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We report first study of complex field inflation. Although understood as a specific two-field inflation, a complex field inflation is able to make more robust model predictions on primordial curvature perturbation. Explicitly we discuss the model realizations of complex chaotic and exponential inflation in various large-field contexts. Both complex field models contain a single complex scalar together with only two free parameters. Using numerical handles aimed to calculate primordial curvature perturbation from multifield inflation, we show that both models are compatible with current Planck data, and the individual surviving parameter space can be substantially or fully probed by future CMB-S4 experiments.
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Complex Inflaton Potentials with Nonminimal Coupling: Robust Inflation and Geometric Reheating
A complex-scalar inflation model with a non-Hermitian imaginary potential claims geometric reheating, but the reheating evidence is internally contradictory and the CMB predictions reduce to fitted α-attractor results.
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