Inflation with large supergravity corrections

Abstract

It is well known that large Hubble-induced supergravity corrections to the inflaton field can ruin the flatness of the potential, thus creating a tension between slow-roll inflation and supergravity. In this paper we show that it is possible to obtain a {\it cosmologically flat} direction, embedded within the minimal supersymmetric standard model, despite very large super-Hubble corrections. As an illustration, we show that a flat direction which is lifted by an $n=6$ operator matches the current cosmic microwave background data for a wide range of the Hubble parameter, $10^5\mathrm{GeV}\lesssim H_{inf}\lesssim 10^{8.5}$ GeV. Our approach can be applied to any $F$-term inflationary model.

5 pages, 1 figure. This version updated to match published version in PRD. Title changed in accordance with journal request

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• Radiative plateau inflation
• Visible sector inflation and the right thermal history in light of Planck data
• Simplified Smooth Inflation with Observable Gravity Waves
• Probing the Supersymmetric Inflaton and Dark Matter link via the CMB, LHC and XENON1T experiments
• Bound on largest $r\lesssim 0.1$ from sub-Planckian excursions of inflaton
• Inflection point inflation and dark energy in supergravity
• Galileogenesis: A new cosmophenomenological zip code for reheating through R-parity violating coupling
• Observable tensor-to-scalar ratio and secondary gravitational wave background
• Reconstructing inflationary potential from NANOGrav 15-year Data: A robust study using Non-Bunch Davies initial condition