Robust Field-level Likelihood-free Inference with Galaxies

no code implementations • 27 Feb 2023 • Natalí S. M. de Santi, Helen Shao, Francisco Villaescusa-Navarro, L. Raul Abramo, Romain Teyssier, Pablo Villanueva-Domingo, Yueying Ni, Daniel Anglés-Alcázar, Shy Genel, Elena Hernandez-Martinez, Ulrich P. Steinwandel, Christopher C. Lovell, Klaus Dolag, Tiago Castro, Mark Vogelsberger

We train graph neural networks to perform field-level likelihood-free inference using galaxy catalogs from state-of-the-art hydrodynamic simulations of the CAMELS project.

valid

Robust field-level inference with dark matter halos

no code implementations • 14 Sep 2022 • Helen Shao, Francisco Villaescusa-Navarro, Pablo Villanueva-Domingo, Romain Teyssier, Lehman H. Garrison, Marco Gatti, Derek Inman, Yueying Ni, Ulrich P. Steinwandel, Mihir Kulkarni, Eli Visbal, Greg L. Bryan, Daniel Angles-Alcazar, Tiago Castro, Elena Hernandez-Martinez, Klaus Dolag

More importantly, we find that our models are very robust: they can infer the value of $\Omega_{\rm m}$ and $\sigma_8$ when tested using halo catalogues from thousands of N-body simulations run with five different N-body codes: Abacus, CUBEP$^3$M, Enzo, PKDGrav3, and Ramses.

On the origin of surprisingly cold gas discs in galaxies at high redshift

no code implementations • 11 Mar 2021 • Michael Kretschmer, Avishai Dekel, Romain Teyssier

We address the puzzling observational indications for very "cold" galactic discs at redshifts $z \gtrsim 3$, an epoch when discs are expected to be highly perturbed.

Astrophysics of Galaxies

Cosmological Magnetogenesis: The Biermann Battery during the Epoch of Reionization

no code implementations • 18 Feb 2021 • Omar Attia, Romain Teyssier, Harley Katz, Taysun Kimm, Sergio Martin-Alvarez, Pierre Ocvirk, Joakim Rosdahl

We investigate the effect of the Biermann battery during the Epoch of Reionization (EoR) using cosmological Adaptive Mesh Refinement simulations within the framework of the SPHINX project.

Cosmology and Nongalactic Astrophysics

Euclid preparation: II. The EuclidEmulator -- A tool to compute the cosmology dependence of the nonlinear matter power spectrum

1 code implementation • 12 Sep 2018 • Euclid Collaboration, Mischa Knabenhans, Joachim Stadel, Stefano Marelli, Doug Potter, Romain Teyssier, Laurent Legrand, Aurel Schneider, Bruno Sudret, Linda Blot, Saeeda Awan, Carlo Burigana, Carla Sofia Carvalho, Hannu Kurki-Suonio, Gabriele Sirri

The absolute accuracy of the final nonlinear power spectrum is comparable to one obtained with N-body simulations, i. e. $\sim 1\%$ for $k\lesssim 1\, h\,{\rm Mpc}^{-1}$ and $z\lesssim 3. 5$.

Cosmology and Nongalactic Astrophysics

Dancing in the dark: galactic properties trace spin swings along the cosmic web

no code implementations • 5 Feb 2014 • Yohan Dubois, Christophe Pichon, Charlotte Welker, Damien Le Borgne, Julien Devriendt, Clotilde Laigle, Sandrine Codis, Dmitry Pogosyan, Stéphane Arnouts, Karim Benabed, Emmanuel Bertin, Jeremy Blaizot, François Bouchet, Jean-François Cardoso, Stéphane Colombi, Valérie de Lapparent, Vincent Desjacques, Raphaël Gavazzi, Susan Kassin, Taysun Kimm, Henry McCracken, Bruno Milliard, Sébastien Peirani, Simon Prunet, Stéphane Rouberol, Joseph Silk, Adrianne Slyz, Thierry Sousbie, Romain Teyssier, Laurence Tresse, Marie Treyer, Didier Vibert, Marta Volonteri

A large-scale hydrodynamical cosmological simulation, Horizon-AGN, is used to investigate the alignment between the spin of galaxies and the cosmic filaments above redshift 1. 2.

Cosmology and Nongalactic Astrophysics

RAMSES-RT: Radiation hydrodynamics in the cosmological context

1 code implementation • 26 Apr 2013 • Joakim Rosdahl, Jeremy Blaizot, Dominique Aubert, Timothy Stranex, Romain Teyssier

We present a new implementation of radiation hydrodynamics (RHD) in the adaptive mesh refinement (AMR) code RAMSES.

Cosmology and Nongalactic Astrophysics