Tracing cosmic stretch marks: probing scale invariance in the early Universe
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arXiv
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| Auteurs principaux: | , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866910641032265728 |
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| author | De Angelis, Mariaveronica Cecchini, Chiara Rinaldi, Massimiliano |
| author_facet | De Angelis, Mariaveronica Cecchini, Chiara Rinaldi, Massimiliano |
| contents | This paper investigates a scale-invariant inflationary model characterized by a scalar field non-minimally coupled to gravity and a curvature term quadratic in the Ricci scalar. The model's dynamic is analyzed using a full numerical solution of the two-field system, going beyond previous analytical studies. We derive robust constraints on the model parameters using the latest Cosmic Microwave Background (CMB) data from Planck and BICEP/Keck. The study confirms that scale-invariance effectively reduces the system to single-field dynamics, eliminating entropy perturbations and ensuring stability. Key predictions include a minimal level of primordial gravitational waves with a tensor-to-scalar ratio r > 0.003, which upcoming CMB experiments are well-positioned to test. The model is compared to Starobinsky and $α$ - attractor inflation, with future observations of tensor modes offering a potential discriminator between them. Overall, the results suggest that scale-invariant inflation is a viable and competitive framework for explaining early universe dynamics and predicting cosmological observables. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_05977 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Tracing cosmic stretch marks: probing scale invariance in the early Universe De Angelis, Mariaveronica Cecchini, Chiara Rinaldi, Massimiliano High Energy Physics - Theory Cosmology and Nongalactic Astrophysics This paper investigates a scale-invariant inflationary model characterized by a scalar field non-minimally coupled to gravity and a curvature term quadratic in the Ricci scalar. The model's dynamic is analyzed using a full numerical solution of the two-field system, going beyond previous analytical studies. We derive robust constraints on the model parameters using the latest Cosmic Microwave Background (CMB) data from Planck and BICEP/Keck. The study confirms that scale-invariance effectively reduces the system to single-field dynamics, eliminating entropy perturbations and ensuring stability. Key predictions include a minimal level of primordial gravitational waves with a tensor-to-scalar ratio r > 0.003, which upcoming CMB experiments are well-positioned to test. The model is compared to Starobinsky and $α$ - attractor inflation, with future observations of tensor modes offering a potential discriminator between them. Overall, the results suggest that scale-invariant inflation is a viable and competitive framework for explaining early universe dynamics and predicting cosmological observables. |
| title | Tracing cosmic stretch marks: probing scale invariance in the early Universe |
| topic | High Energy Physics - Theory Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2410.05977 |