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Theoretical and observational consequences of the Geometrical Destabilization of Inflation

Total Cost €


EC-Contrib. €






Project "GEODESI" data sheet

The following table provides information about the project.


Organization address
address: RUE MICHEL ANGE 3
city: PARIS
postcode: 75794

contact info
title: n.a.
name: n.a.
surname: n.a.
function: n.a.
email: n.a.
telephone: n.a.
fax: n.a.

 Coordinator Country France [FR]
 Project website
 Total cost 1˙476˙672 €
 EC max contribution 1˙476˙672 € (100%)
 Programme 1. H2020-EU.1.1. (EXCELLENT SCIENCE - European Research Council (ERC))
 Code Call ERC-2017-STG
 Funding Scheme ERC-STG
 Starting year 2018
 Duration (year-month-day) from 2018-02-01   to  2023-01-31


Take a look of project's partnership.

# participants  country  role  EC contrib. [€] 


 Project objective

The GEODESI project aims at interpreting current and forthcoming cosmological observations in a renewed theoretical framework about cosmological inflation and its ending. The simplest toy models of inflation economically explain all current data, leaving no observational clue to guide theorists towards a finer physical understanding. In this context, I very recently unveiled an hitherto unnoticed instability at play in the primordial universe that potentially affects all inflationary models and drastically modifies the interpretation of cosmological observations in terms of fundamental physics. The so-called Geometrical Destabilization of inflation reshuffles our understanding of the origin of structures in the universe, offers a new mechanism to end inflation, and promises unrivaled constraints on high-energy physics. It is crucial to develop this fresh look before a host of high-quality data from large-scale structure surveys and cosmic microwave background observations become available within the 5 year timescale of the project.

With the ERC grant I plan to build a group at the Institute of Astrophysics of Paris (IAP-CNRS) with the objective of determining the full theoretical and observational consequences of the geometrical destabilization of inflation. We will combine insights from non-standard cosmological perturbation theory and lattice simulations to constrain realistic models of inflation in high-energy physics, producing accurate theoretical predictions for a wide variety of observables, including the spectra and the non-Gaussianities of primordial fluctuations and stochastic backgrounds of gravitational waves.


year authors and title journal last update
List of publications.
2019 Oskar Grocholski, Marcin Kalinowski, Maciej Kolanowski, Sébastien Renaux-Petel, Krzysztof Turzyński, Vincent Vennin
On backreaction effects in geometrical destabilisation of inflation
published pages: 008-008, ISSN: 1475-7516, DOI: 10.1088/1475-7516/2019/05/008
Journal of Cosmology and Astroparticle Physics 2019/05 2019-09-26
2018 Sebastian Garcia-Saenz, Sébastien Renaux-Petel, John Ronayne
Primordial fluctuations and non-Gaussianities in sidetracked inflation
published pages: 057-057, ISSN: 1475-7516, DOI: 10.1088/1475-7516/2018/07/057
Journal of Cosmology and Astroparticle Physics 2018/07 2019-09-26
2018 Sebastian Garcia-Saenz, Sébastien Renaux-Petel
Flattened non-Gaussianities from the effective field theory of inflation with imaginary speed of sound
published pages: 005-005, ISSN: 1475-7516, DOI: 10.1088/1475-7516/2018/11/005
Journal of Cosmology and Astroparticle Physics 2018/11 2019-09-26
2019 Lucas Pinol, Sébastien Renaux-Petel, Yuichiro Tada
Inflationary stochastic anomalies
published pages: 07LT01, ISSN: 0264-9381, DOI: 10.1088/1361-6382/ab097f
Classical and Quantum Gravity 36/7 2019-09-26

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