Inflation with Massive Vector Fields

Abstract

We investigate the coupling between the inflaton and massive vector fields. All renormalizable couplings with shift symmetry of the inflaton are considered. The massive vector can be decomposed into a scalar mode and a divergence-free vector mode. We show that the former naturally interacts with the inflaton and the latter decouples at tree level. The model in general predicts $f_{NL}^{\mathrm{equil}}=\mathcal{O}(1)$, while in some regions of the parameter space large non-Gaussianity can arise.

18 pages, 2 figures

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• Heavy Spinning Particles from Signs of Primordial Non-Gaussianities: Beyond the Positivity Bounds
• Warm Quasi-Single Field Inflation
• Axion Isocurvature Collider
• Continuous Spectrum on Cosmological Collider
• Inflationary Magnetogenesis with Broken Local U(1) Symmetry
• Analytic Formulae for Inflationary Correlators with Dynamical Mass
• Perturbative unitarity in quasi-single field inflation
• Non-Gaussianity from $X,Y$ gauge bosons in Cosmological Collider Physics
• On the importance of heavy fields in pseudo-scalar inflation