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| Formato: | Preprint |
| Publicado: |
2025
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| Acceso en línea: | https://arxiv.org/abs/2505.03004 |
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| _version_ | 1866910929135861760 |
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| author | Yin, Wen |
| author_facet | Yin, Wen |
| contents | Recent analyses that combine the latest data from the Atacama Cosmology Telescope (ACT) with cosmic microwave background observations by BICEP/Keck and Planck, together with the DESI baryon acoustic-baryonic-oscillation (BAO) measurements, have tightened the limits on inflationary scenarios. The joint data set yields a spectral index of primordial scalar perturbations $n_s = 0.9743 \pm 0.0034$ and an upper bound on the tensor-to-scalar ratio of $r < 0.038$. This slight upward shift in $n_s$ puts the previously favored Starobinsky model, and the conventional metric Higgs(-like) inflation--based on a quartic potential with a large non-minimal coupling in the Jordan frame--under tension with observations. In metric Higgs-like inflation the attractor behavior makes the predictions remarkably stable against higher-order operators, so modifying $n_s$ through such terms is difficult. In this paper, I show that adding a quadratic mass term to the Jordan-frame potential can raise $n_s$ and restore compatibility with the new data. I also discuss how this mass term can naturally arise from threshold effects in Higgs inflation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_03004 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Higgs-like inflation under ACTivated mass Yin, Wen High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology Recent analyses that combine the latest data from the Atacama Cosmology Telescope (ACT) with cosmic microwave background observations by BICEP/Keck and Planck, together with the DESI baryon acoustic-baryonic-oscillation (BAO) measurements, have tightened the limits on inflationary scenarios. The joint data set yields a spectral index of primordial scalar perturbations $n_s = 0.9743 \pm 0.0034$ and an upper bound on the tensor-to-scalar ratio of $r < 0.038$. This slight upward shift in $n_s$ puts the previously favored Starobinsky model, and the conventional metric Higgs(-like) inflation--based on a quartic potential with a large non-minimal coupling in the Jordan frame--under tension with observations. In metric Higgs-like inflation the attractor behavior makes the predictions remarkably stable against higher-order operators, so modifying $n_s$ through such terms is difficult. In this paper, I show that adding a quadratic mass term to the Jordan-frame potential can raise $n_s$ and restore compatibility with the new data. I also discuss how this mass term can naturally arise from threshold effects in Higgs inflation. |
| title | Higgs-like inflation under ACTivated mass |
| topic | High Energy Physics - Phenomenology Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2505.03004 |