Kinetically Modified Palatini Inflation Meets ACT Data

Abstract

We show that the coexistence of a non-minimal coupling to gravity $f_{\mathcal{R}}=1+c_{\mathcal{R}}{\varphi }^{n/2}$ with a kinetic mixing of the form $f_K=f_{\mathcal{R}}^m$ -- where $n=2$ and $4$ and $0.5\le m\le 10$ -- reconciles chaotic inflation based on the ${\varphi }^n$ 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.

Minor revisions made

References in corpus (10)

• BICEP / Keck XIII: Improved Constraints on Primordial Gravitational Waves using Planck, WMAP, and BICEP/Keck Observations through the 2018 Observing Season
• Higgs inflation: consistency and generalisations
• Reheating constraints to inflationary models
• Inflation with Non-Minimal Coupling: Metric vs. Palatini Formulations
• Reheating predictions in single field inflation
• General inflaton potentials in supergravity
• Higgs-Palatini Inflation and Unitarity
• Constraints on Kinetically Modified Inflation from WMAP5
• Gravity Waves From Non-Minimal Quadratic Inflation
• Starobinsky Inflation with T-Model Kaehler Geometries

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• Updating GUT-Scale Pole Higgs Inflation After ACT DR6
• Radiative-Corrected Higgs Inflation in Light of the Latest ACT Observations
• Constraining non-minimally coupled squared-Quartic Hilltop Inflation in light of ACT observations
• Constraining $\beta$-Exponential Inflation with the latest ACT observations
• Harrison-Zeldovich attractor: From Planck to ACT results
• Induced-Gravity Palatini-Like Higgs Inflation in Supergravity Confronts ACT DR6
• Probing the Perturbative Reheating History of Decaying Oscillatory Inflation with ACT Constraints
• Echoes of $R^3$ modification and Goldstone preheating in the CMB-BAO landscape
• Reconciling the ACT Preference in $f(T)$ Gravity: Inflation and Reheating Constraints
• Constraints on non-canonical chaotic inflation from ACT DR6 and BICEP/Keck data
• Inflationary assessment of $F(\mathcal{R},\tilde{\mathcal{R}})$ Einstein-Cartan models
• (Lovelock)${}^2$ inflation: explaining the ACT data and equivalence to Higgs-Gauss-Bonnet inflation