Phases of Inflation

Abstract

Motivated by the 4d effective field theories for closed string axions in Type II string compactifications with D-branes, we consider chiral gauge theories coupled to multiple axions. We discuss how well-known non-perturbative dynamical phenomena, such as gauge instantons, fermion confinement and Nambu-Jona-Lasinio interactions, give rise to non-trivial vacuum configurations in the IR. The fluctuations about the IR vacuum are captured by some remaining closed string axions and infladrons (scalar chiral condensate excitations), which acquire dynamical masses. By employing the full power of the effective field theory, we investigate the applicability of these IR theories as inflationary models (natural, monodromy, Starobinsky) and connect different types of inflationary scenarios to different phases of the non-Abelian gauge theory or the Nambu-Jona-Lasinio four-fermion couplings. The back-reaction of the infladrons flattens the axion potential in natural-like inflationary models, such that the tension with current CMB data with respect to the spectral index and the tensor-to-scalar ratio can be partially alleviated.

1+67 pages, 16 figures

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Cited by in corpus (6)

• Gravitational wave forest from string axiverse
• Gauge and gravitational instantons: From 3-forms and fermions to Weak Gravity and flat axion potentials
• The Holographic QCD Axion
• The Super-Planckian Axion Strikes Back
• Natural inflation, strong dynamics, and the role of generalized anomalies
• Axion scales and couplings with Stückelberg mixing