Non-canonical inflation coupled to matter

Abstract

We compute corrections to the inflationary potential due to conformally coupled non-relativistic matter. We find that under certain conditions of the matter coupling, inflation may be interrupted abruptly. We display this in the superconformal Starobinsky model, where matter is conformally coupled to the Einstein frame metric. These corrections may easily stop inflation provided that there is an initial density of non-relativistic matter. Since these additional heavy degrees of freedom generically occur in higher dimension theories, for example as Kaluza-Klein modes, this effect can arise in multiple scenarios.

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• Tachyon inflation with steep potentials
• Brane inflation and Trans-Planckian censorship conjecture
• Inflation with non-canonical scalar fields revisited
• Conformal inflation with chameleon coupling
• Hamilton-Jacobi formalism for k-inflation
• Constraints on non-canonical chaotic inflation from ACT DR6 and BICEP/Keck data
• Reconstructing square-law k-inflation from Planck data