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This is a Quantitative Study study.

September 20, 2025Open Access

ACT-inspired Kähler-based inflationary attractors

CPC. PallisAristotle University of Thessaloniki

Key Points

The proposed inflationary attractors achieve consistency with recent ACT observational results, supporting their viability in cosmological models.
Using kähler potentials with chaotic potentials, the model produces inflationary observables that are largely independent of parameters qM and n.
The models introduce two chiral superfields alongside a monomial superpotential, facilitating a supergravity realization of the inflation mechanism.
The predicted large tensor-to-scalar ratios increase with N, highlighting the attractive nature and feasibility of achieving inflation at subplanckian inflaton values.

Abstract

Abstract We develop a new class of cosmological attractors which are compatible with the recent ACT results. They are based on two types of fractional Kähler potentials, K , for a gauge-singlet inflaton ϕ which reduce, along the inflationary path, to the form N /(1- ϕ q M ) p with q M = 1,2 and 0.1 ≤ p ≤ 10. The combination of these K 's with the chaotic potentials ϕ n (where n = 2, 4) within a non-linear sigma model leads to inflationary observables which are consistent with the current data and largely independent from q M and n . Endowing these K 's with a shift symmetry we also offer a supergravity realization of our models introducing two chiral superfields and a monomial superpotential, linear with respect to the inflaton-accompanying field. The attainment of inflation with subplanckian inflaton values and the large values for the tensor-to-scalar ratio, which increases with N , are two additional attractive features of our proposal.

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