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arXiv · 2211.04441

Double-copy towards supergravity inflation with $\alpha$-attractor models

John Joseph M. Carrasco·Matthew Lewandowski·Nicolas H. Pavao
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Abstract

Key to the simplicity of supergravity $\alpha$-attractor models of inflation are Volkov-Akulov fermions, often in the form of nilpotent superfields. Here we explore the possibility of using the double-copy to construct theories of Dirac-Born-Infeld-Volkov-Akulov (DBIVA) coupled to supergravity. A color-dual bootstrap admits scattering amplitudes involving pions and vectors through five-point tree-level order by order in mass-dimension, but requires the introduction of a $\text{Tr}(F^3)$ operator. Gauge theories with this operator were recently found to require a tower of higher-derivative operators to be compatible with color-kinematics duality. Adjoint-type double-copy construction at its most conservative seems to require the UV completion of DBIVA + pure Poincar\'{e} supergravity scattering amplitudes to a family of theories involving DBIVA-like particles coupled to Weyl-Einstein supergravity. We also point out an alternative solution to color-dual gauged pions that allows adjoint double-copy without a tower of higher derivative corrections but at the cost of exchange symmetry between scalars.

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John Joseph M. Carrasco, Matthew Lewandowski, Nicolas H. Pavao. 2022-11-08. Double-copy towards supergravity inflation with $\alpha$-attractor models. https://doi.org/10.1007/jhep02(2023)015

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