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<p>The Higgs inflation model with nonminimal coupling, while disfavored by the 1<i>σ</i> region of the latest Atacama Cosmology Telescope Data Release 6 (ACT DR6) observational data, can be reconciled with the ACT DR6 data by incorporating the effects of reheating. In this paper, we consider reheating with a constant equation of state <i>w</i><sub><i>re</i></sub>. For the strong coupling case <i>ξ</i> = 100, we find that reconciling the model with both the ACT DR6 constraints and the minimum reheating temperature required for successful Big Bang Nucleosynthesis (BBN) demands <i>w</i><sub><i>re</i></sub> ⩾ 0.92. Specifically, the reheating <i>e</i>-folding number must be <i>N</i><sub><i>re</i></sub> = 28.3 for <i>w</i><sub><i>re</i></sub> = 0.92, and within 24.9 ⩽ <i>N</i><sub><i>re</i></sub> ⩽ 27.2 for <i>w</i><sub><i>re</i></sub> = 1. In the more general case without assuming the strong coupling limit, consistency with both ACT and BBN requires the nonminimal coupling to satisfy <i>ξ</i> ⩾ 0.05. Our findings suggest that by considering reheating, a wide range of inflationary models, such as <i>R</i><sup>2</sup> inflation, hilltop inflation, E-model inflation, and T-model inflation, can also be made consistent with the ACT DR6 observational data.</p>

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Reconciling nonminimally coupled Higgs inflation with ACT DR6 observations through reheating

  • 期刊论文

  • 发表日期：

    2026年6月23日

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  • Lang Liu,
  • Zhu Yi,
  • Yungui Gong

摘要

The Higgs inflation model with nonminimal coupling, while disfavored by the 1σ region of the latest Atacama Cosmology Telescope Data Release 6 (ACT DR6) observational data, can be reconciled with the ACT DR6 data by incorporating the effects of reheating. In this paper, we consider reheating with a constant equation of state wre. For the strong coupling case ξ = 100, we find that reconciling the model with both the ACT DR6 constraints and the minimum reheating temperature required for successful Big Bang Nucleosynthesis (BBN) demands wre ⩾ 0.92. Specifically, the reheating e-folding number must be Nre = 28.3 for wre = 0.92, and within 24.9 ⩽ Nre ⩽ 27.2 for wre = 1. In the more general case without assuming the strong coupling limit, consistency with both ACT and BBN requires the nonminimal coupling to satisfy ξ ⩾ 0.05. Our findings suggest that by considering reheating, a wide range of inflationary models, such as R2 inflation, hilltop inflation, E-model inflation, and T-model inflation, can also be made consistent with the ACT DR6 observational data.