ACT-inspired Kähler-based inflationary attractors

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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