Kinetically Modified Palatini Inflation Meets ACT Data

C. Pallis

doi:10.1016/j.physletb.2025.139739

paper

Kinetically Modified Palatini Inflation Meets ACT Data

arXiv:2505.23243 · doi:10.1016/j.physletb.2025.139739

Abstract

We show that the coexistence of a non-minimal coupling to gravity $f_{R} = 1 + c_{R} ϕ^{n /2}$ with a kinetic mixing of the form $f_{K} = f_{R}^{m}$ -- where $n = 2$ and $4$ and $0.5 \leq m \leq 10$ -- reconciles chaotic inflation based on the $ϕ^{n}$ potential with the recent ACT results, if we adopt the Palatini formulation of gravity. The attainment of inflation allows for subplanckian inflaton values and energy scales below the cut-off scale of the corresponding effective theory. The model can be also embedded in supergravity by introducing two chiral superfields and a monomial superpotential, linear with respect to the inflaton-accompanying field. Its stabilization is achieved thanks to a compact contribution to the Kaehler potential, whose the inflationary part includes an holomorphic logarithmic term and a real one multiplying a shift-symmetric quadratic polynomial term.

arXiv commentMinor revisions made

Kinetically Modified Palatini Inflation Meets ACT Data

Abstract

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