26-30 July 2021
Europe/Berlin timezone

Inflation with strongly non-geodesic motion: theoretical motivations and observational imprints

29 Jul 2021, 17:10


Parallel session talk Cosmology T02: Cosmology


Sébastien Renaux-Petel (Institut d'Astrophysique de Paris)


A new class of inflationary attractors characterized by a strongly non-geodesic motion has been discovered in the past few years. I will describe how they naturally arise in negatively curved field space, allowing to inflate on potentials that are steep in Planck units. In these scenarios, primordial fluctuations often experience a transient tachyonic instability, akin to the one occurring in axion gauge-field inflation, and which can be described by a single-field effective field theory with imaginary sound speed. Independently of its precise origin, I will show how this leaves a peculiar imprint in the form of primordial non-Gaussianities of flattened type for all higher-order correlation functions, and I will mention links with primordial black holes and specific signatures in the stochastic gravitational wave background.

First author Sébastien Renaux-Petel
Collaboration / Activity Theory/observation
Email renaux@iap.fr

Primary author

Sébastien Renaux-Petel (Institut d'Astrophysique de Paris)

Presentation Materials