Loop Blow-Up Inflation: a novel way to inflate with the Kähler moduli
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866912239885221888 |
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| author | Brunelli, Luca |
| author_facet | Brunelli, Luca |
| contents | The topic of this talk is a new inflationary model in the context of Type IIB string compactifications called Loop Blow-Up Inflation, presented in arXiv:2403.04831. The original Blow-Up Inflation model, whose potential was purely non-perturbative, suffers from the $η$-problem, being sensitive to string-loop corrections. If these corrections are introduced in the nflationary potential, they become dominant over the non-perturbative contributions as soon as the inflaton is displaced from its minimum. Therefore, the inflationary potential takes a new inverse-power law behavior. We show that slow-roll inflation is not ultimately spoiled and focus on the post-inflationary history in different scenarios of microscopic Standard Model (SM) realization. Each of them gives precise predictions for the spectral index and the tensor-to-scalar ratio in agreement with CMB data .The model also predicts an amount of dark radiation potentially observable by next-generation CMB experiments. This article is a contribution to the proceedings of the Second General Meeting of the COST Action CA21106 Cosmic WISPers. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2502_14953 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Loop Blow-Up Inflation: a novel way to inflate with the Kähler moduli Brunelli, Luca High Energy Physics - Theory Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology The topic of this talk is a new inflationary model in the context of Type IIB string compactifications called Loop Blow-Up Inflation, presented in arXiv:2403.04831. The original Blow-Up Inflation model, whose potential was purely non-perturbative, suffers from the $η$-problem, being sensitive to string-loop corrections. If these corrections are introduced in the nflationary potential, they become dominant over the non-perturbative contributions as soon as the inflaton is displaced from its minimum. Therefore, the inflationary potential takes a new inverse-power law behavior. We show that slow-roll inflation is not ultimately spoiled and focus on the post-inflationary history in different scenarios of microscopic Standard Model (SM) realization. Each of them gives precise predictions for the spectral index and the tensor-to-scalar ratio in agreement with CMB data .The model also predicts an amount of dark radiation potentially observable by next-generation CMB experiments. This article is a contribution to the proceedings of the Second General Meeting of the COST Action CA21106 Cosmic WISPers. |
| title | Loop Blow-Up Inflation: a novel way to inflate with the Kähler moduli |
| topic | High Energy Physics - Theory Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology |
| url | https://arxiv.org/abs/2502.14953 |