Clocking the end of cosmic inflation
(2024) Journal of Cosmology and Astroparticle Physics — Vol. 2024, n° 10, p. 49 (2024)
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- Abstract
- Making observable predictions for cosmic inflation requires determining when the wavenumbers of astrophysical interest today exited the Hubble radius during the inflationary epoch. These instants are commonly evaluated using the slow-roll approximation and measured in e-folds Δ N=N - Nend, in reference to the e-fold Nend at which inflation ended. Slow roll being necessarily violated towards the end of inflation, both the approximated trajectory and Nend are determined at, typically, one or two e-folds precision. Up to now, such an uncertainty has been innocuous, but this will no longer be the case with the forthcoming cosmological measurements. In this work, we introduce a new and simple analytical method, on top of the usual slow-roll approximation, that reduces uncertainties on ΔN to less than a tenth of an e-fold.
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Citations
Auclair, P., Blachier, B., & Ringeval, C. (2024). Clocking the end of cosmic inflation. Journal of Cosmology and Astroparticle Physics, 2024(10), 49. https://doi.org/10.1088/1475-7516/2024/10/049 (Original work published 2024)