ACT-inspired Kähler-based inflationary attractors

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 ϕⁿ (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.