Exploring the Exponential Tail of Inflationary Perturbations
Jose María Ezquiaga (University of Chicago)
Abstract: Typically when we work with the primordial spectrum of inflationary perturbations we approximate it as nearly Gaussian due to the tight CMB constraints. However, away from its maximum, the distribution is poorly known. We develop a generic, non-perturbative method to compute the tails of these distributions, which we find to decay exponentially thus being unavoidably non-Gaussian. Knowing the tails precisely is relevant for example for rare, extreme objects such as primordial black holes. Applying this new technique, we find that potentials with an inflection point overproduce PBHs, unless slow roll is violated.
Video of Talk: https://www.youtube.com/watch?v=dicQJ73FyE8
Paper: [1912.05399] The exponential tail of inflationary fluctuations: consequences for primordial black holes, by Jose María Ezquiaga, Juan García-Bellido, Vincent Vennin
cosmology and nongalactic astrophysicsgeneral relativity and quantum cosmology
Audience: advanced learners
CosmoConβ - Cosmology from Home
Series comments: Cosmology from Home is an online cosmology conference. One of its features are pre-recorded talks, publicly available at its YouTube channel.
| Organizers: | Niko Sarcevic, Shaun Hotchkiss* |
| Curator: | Jerry M.* |
| *contact for this listing |