Our mission

We are an international collaboration of researchers interested in developing and applying cutting-edge statistical inference techniques to study the spatial distribution of matter in our Universe. We embrace the latest innovations in information theory and artificial intelligence to optimally extract physical information from data and use derived results to facilitate new discoveries.

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Our latest results

Constraints on intrinsic alignment

Field-level inference on galaxy intrinsic alignment

Elliptical galaxies tend to align with the large scale structures for two reasons: through intrinsic deformations and tilting during their formation or gravitational weak lensing. Here, we constrain the intrinsic alignment for luminous red giants in the SDSS3-BOSS sample, using 3D tidal fields constrained with forward modeling of SDSS3-BOSS data. We have found 4σ evidence of intrinsic alignment at 20 Mpc/h.

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Speed of light

Is the speed of light energy dependent?

High energy astrophysical transients at cosmological distances allow us to test the fundamental assumptions of the standard models of cosmology and particle physics, such as the Weak Equivalence Principle, Lorentz Invariance or the massless nature of the photon. A violation of any of these would result in energy-dependent arrival times for photons from distant sources. We forward model these time delays for gamma ray bursts using the BORG SDSS-III/BOSS reconstruction and compare to data to constrain the quantum gravity energy scale, the mass of the photon, and violations of the Weak Equivalence Principle.

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Black holes

Testing gravity with the positions of supermassive black holes

A key frontier in cosmology is testing the nature of gravity. We use constrained simulations of local structure based on the BORG algorithm to map out the scalar field in galileon gravity, a leading competitor to General Relativity. From this we predict the behaviour of supermassive black holes in galaxies, and then compare with observational data to constrain the coupling strength of the galileon.

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Funding partners

We currently receive individual funding provided by the French ANR (BIG4 ANR-16-CE23-0002), the ERC, the Institut Lagrange de Paris (ANR-10-LABX-63, ANR-11-IDEX-0004-02), the CNRS, the Max Planck Institute for Astrophysics, and Imperial College London. Super computing time is provided in France by the CINES (allocation A0020410153, A0040410153). A number of individuals are funded by the Simons Foundation"Learning the Universe"