Kinetic Preheating after α-attractor Inflation

2023/11/28 by Peter Adshead, Adshead, Peter, John T. Giblin +3 · 2 citations
Earth and Planetary Sciences · Physics and Astronomy · #Cosmology and Gravitation Theories #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Geophysics and Gravity Measurements #Solar and Space Plasma Dynamics

paper · pdf · doi:10.48550/arxiv.2311.17237

openalex publication_date 2023/11/28 · openalex created_date 2023/12/01 · openalex updated_date 2026/07/28

Abstract

We study preheating via kinetic couplings after dilaton-axion α-attractor inflation. We focus on E-model α-attractor driven inflation where the inflaton is kinetically coupled to an ultralight axion. In this class of models, the kinetic coupling is related to the form of the potential, and once the amplitude of the scalar curvature spectrum as well as the tensor-to-scalar ratio are specified, the model has no free parameters. We find that kinetic preheating can be extremely efficient, with stronger preheating occurring at parameter values corresponding to smaller values of the tensor-to-scalar ratio. Preheating becomes extremely efficient below r \lesssim 1.6× 10^-5.

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