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  • Open Access

Updating GUT-scale pole Higgs inflation after ACT DR6

Constantinos Pallis*

  • *Contact author: kpallis@auth.gr
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Phys. Rev. D 113, 015033 – Published 23 January, 2026

DOI: https://doi.org/10.1103/h1p2-c333

Abstract

We consider models of chaotic inflation driven by the real parts of a conjugate pair of Higgs superfields involved in the spontaneous breaking of a grand unification symmetry at a scale assuming its value within the minimal supersymmetric Standard Model (MSSM). We combine a superpotential, which is uniquely determined by applying a continuous R symmetry, with two fractional shift-symmetric Kähler potential s introducing two free parameters (p,N). The inflationary observables provide an excellent match to the recent Atacama Cosmology Telescope data for 1.355≤p≤6.7 and 6×10−5≤N≤0.7. The attainment of inflation allows for sub-Planckian inflaton values and possibly detectable primordial gravitational waves with (p,N) values of order unity. A solution to the μ problem of MSSM and baryogenesis via nonthermal leptogenesis can be also accommodated by embedding the model into a B−L extension of the MSSM.

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Phys. Rev. D 113, 015033– Published 23 January, 2026
  • Received 3 October 2025
  • Accepted 23 December 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

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