Testing $α$-attractor quintessential inflation against CMB and low-redshift data
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| Format: | Preprint |
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2024
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| _version_ | 1866912131347120128 |
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| author | Giarè, William Di Valentino, Eleonora Linder, Eric V. Specogna, Enrico |
| author_facet | Giarè, William Di Valentino, Eleonora Linder, Eric V. Specogna, Enrico |
| contents | Due to universality and attractor properties, $α$-attractor quintessential inflation establishes direct relations between inflationary observables such as the scalar tilt $n_s$ and the tensor-to-scalar ratio $r$, and late-time dark energy equation of state parameters $w_0$ and $w_a$. In this work, we examine three different physically motivated regimes, considering complete freedom in the parameter $α$, models inspired by supergravity where $α$ takes on values up to $α=7/3$, and Starobinsky inflation ($α=1$). We investigate the consistency and constraints imposed by Cosmic Microwave Background measurements from the Planck satellite, B-mode polarization data from the BICEP/Keck collaboration, and low-redshift observations. Additionally, we consider small-scale CMB measurements released by the Atacama Cosmology Telescope, which give results approaching the Harrison-Zel'dovich spectrum ($n_s \approx 1$). Here $α$-attractors lead to an improved fit over $Λ$CDM. For the large-scale CMB measurements, $α\gtrsim2$ models can provide equally good fits as $Λ$CDM. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2402_01560 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Testing $α$-attractor quintessential inflation against CMB and low-redshift data Giarè, William Di Valentino, Eleonora Linder, Eric V. Specogna, Enrico Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology Due to universality and attractor properties, $α$-attractor quintessential inflation establishes direct relations between inflationary observables such as the scalar tilt $n_s$ and the tensor-to-scalar ratio $r$, and late-time dark energy equation of state parameters $w_0$ and $w_a$. In this work, we examine three different physically motivated regimes, considering complete freedom in the parameter $α$, models inspired by supergravity where $α$ takes on values up to $α=7/3$, and Starobinsky inflation ($α=1$). We investigate the consistency and constraints imposed by Cosmic Microwave Background measurements from the Planck satellite, B-mode polarization data from the BICEP/Keck collaboration, and low-redshift observations. Additionally, we consider small-scale CMB measurements released by the Atacama Cosmology Telescope, which give results approaching the Harrison-Zel'dovich spectrum ($n_s \approx 1$). Here $α$-attractors lead to an improved fit over $Λ$CDM. For the large-scale CMB measurements, $α\gtrsim2$ models can provide equally good fits as $Λ$CDM. |
| title | Testing $α$-attractor quintessential inflation against CMB and low-redshift data |
| topic | Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2402.01560 |