A grounded perspective on new early dark energy using ACT, SPT, and BICEP/Keck
Abstract We examine further the ability of the New Early Dark Energy model (NEDE) to resolve the current tension between the Cosmic Microwave Background (CMB) and local measurements of H 0 and the consequences for inflation. We perform new Bayesian analyses, including the current datasets from the g...
| Published in: | Journal of Cosmology and Astroparticle Physics |
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| Main Authors: | , , |
| Format: | Article in Journal/Newspaper |
| Language: | unknown |
| Published: |
IOP Publishing
2023
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| Subjects: | |
| Online Access: | http://dx.doi.org/10.1088/1475-7516/2023/02/041 https://iopscience.iop.org/article/10.1088/1475-7516/2023/02/041 https://iopscience.iop.org/article/10.1088/1475-7516/2023/02/041/pdf |
| Summary: | Abstract We examine further the ability of the New Early Dark Energy model (NEDE) to resolve the current tension between the Cosmic Microwave Background (CMB) and local measurements of H 0 and the consequences for inflation. We perform new Bayesian analyses, including the current datasets from the ground-based CMB telescopes Atacama Cosmology Telescope (ACT), the South Pole Telescope (SPT), and the BICEP/Keck telescopes, employing an updated likelihood for the local measurements coming from the S H 0 ES collaboration. Using the S H 0 ES prior on H 0 , the combined analysis with Baryonic Acoustic Oscillations (BAO), Pantheon, Planck and ACT improves the best-fit by Δ χ 2 = -15.9 with respect to ΛCDM, favors a non-zero fractional contribution of NEDE, f NEDE > 0, by 4.8 σ , and gives a best-fit value for the Hubble constant of H 0 = 72.09 km/s/Mpc (mean 71.49 ± 0.82 with 68% C.L.). A similar analysis using SPT instead of ACT yields consistent results with a Δ χ 2 = -23.1 over ΛCDM, a preference for non-zero f NEDE of 4.7 σ and a best-fit value of H 0 = 71.77 km/s/Mpc (mean 71.43 ± 0.85 with 68% C.L.). We also provide the constraints on the inflation parameters r and n s coming from NEDE, including the BICEP/Keck 2018 data, and show that the allowed upper value on the tensor-scalar ratio is consistent with the ΛCDM bound, but, as also originally found, with a more blue scalar spectrum implying that the simplest curvaton model is now favored over the Starobinsky inflation model. |
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