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| Main Authors: | , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2506.14617 |
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| _version_ | 1866912991285346304 |
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| author | Lalak, Z. Michalak, P. |
| author_facet | Lalak, Z. Michalak, P. |
| contents | This work explores the possibility of inflation in a scale-symmetric extension of the Standard Model Higgs sector, where the Higgs field $ϕ_1$ is coupled to a singlet scalar, the dilaton $ϕ_0$. The two-scalar theory is formulated within Weyl geometry, which modifies the Einstein frame form of the resulting single-field inflationary potential. We extend the analysis to include quantum corrections, incorporating curvature effects in the one-loop effective potential. We find that the resulting spectral index $n_s$ and tensor-to-scalar ratio $r_{0.002}$ can be consistent with the Planck 2018 observational constraints. The predicted value $r_{0.002} \lesssim 10^{-6}$ remains too small to yield a detectable gravitational wave signal. In the regime with a strong hierarchy between the non-minimal couplings, $ξ_1\llξ_0$, the unitarity cutoff in the large-field background, $Λ_{UV}\sim M_P/\sqrt{ξ_1}$, lies below the energy scales relevant during inflation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_14617 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Inflation in the Scale Symmetric Standard Model and Weyl geometry Lalak, Z. Michalak, P. High Energy Physics - Phenomenology High Energy Physics - Theory This work explores the possibility of inflation in a scale-symmetric extension of the Standard Model Higgs sector, where the Higgs field $ϕ_1$ is coupled to a singlet scalar, the dilaton $ϕ_0$. The two-scalar theory is formulated within Weyl geometry, which modifies the Einstein frame form of the resulting single-field inflationary potential. We extend the analysis to include quantum corrections, incorporating curvature effects in the one-loop effective potential. We find that the resulting spectral index $n_s$ and tensor-to-scalar ratio $r_{0.002}$ can be consistent with the Planck 2018 observational constraints. The predicted value $r_{0.002} \lesssim 10^{-6}$ remains too small to yield a detectable gravitational wave signal. In the regime with a strong hierarchy between the non-minimal couplings, $ξ_1\llξ_0$, the unitarity cutoff in the large-field background, $Λ_{UV}\sim M_P/\sqrt{ξ_1}$, lies below the energy scales relevant during inflation. |
| title | Inflation in the Scale Symmetric Standard Model and Weyl geometry |
| topic | High Energy Physics - Phenomenology High Energy Physics - Theory |
| url | https://arxiv.org/abs/2506.14617 |