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Higgs-like inflation ACTivated mass

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Analysis shows a modified spectral index in cosmic observations and its implications for Higgs inflation.

The analysis reveals a spectral index of primordial scalar perturbations at 0.9743 ± 0.0034, which suggests challenges for models like the Starobinsky model.
A joint dataset from ACT, BICEP/Keck, and Planck has established a new upper limit on the tensor-to-scalar ratio at r < 0.038, indicating tight constraints on inflationary models.
Incorporating a quadratic mass term into the Jordan-frame potential successfully restores compatibility of Higgs-like inflation with recent observations.
The findings highlight how modifying n s through higher-order operators is challenging, but threshold effects in Higgs inflation can lead to a natural quadratic mass.

Wen Yin (2025) studied this question.

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