no code implementations • 23 Oct 2023 • Natalí S. M. de Santi, Francisco Villaescusa-Navarro, L. Raul Abramo, Helen Shao, Lucia A. Perez, Tiago Castro, Yueying Ni, Christopher C. Lovell, Elena Hernandez-Martinez, Federico Marinacci, David N. Spergel, Klaus Dolag, Lars Hernquist, Mark Vogelsberger
In particular, de Santi et al. (2023) developed models that could accurately infer the value of $\Omega_{\rm m}$ from catalogs that only contain the positions and radial velocities of galaxies that are robust to uncertainties in astrophysics and subgrid models.
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.
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.
1 code implementation • 14 Aug 2022 • Max Lamparth, Ludwig Böss, Ulrich Steinwandel, Klaus Dolag
Cosmological shock waves are essential to understanding the formation of cosmological structures.
1 code implementation • 11 Oct 2021 • Antonio Ragagnin, Alessandra Fumagalli, Tiago Castro, Klaus Dolag, Alexandro Saro, Matteo Costanzi, Sebastian Bocquet
Conclusions: This work provides a preliminary calibration of the cosmological dependency of the satellite abundance of high mass halos, and we showed that modelling HOD with cosmological parameters is necessary to interpret satellite abundance, and we showed the importance of using FP simulations in modelling this dependency.
no code implementations • 3 Feb 2021 • Tim Dykes, Claudio Gheller, Bärbel S. Koribalski, Klaus Dolag, Mel Krokos
Observational astronomers survey the sky in great detail to gain a better understanding of many types of astronomical phenomena.
Instrumentation and Methods for Astrophysics Graphics
no code implementations • 19 Jan 2021 • Saqib Hussain, Rafael Alves Batista, Elisabete M. de Gouveia Dal Pino, Klaus Dolag
For CRs injected with a power-law energy spectrum $\propto E^{-2}$, we find that clusters contribute to the diffuse flux observed by the IceCube Neutrino Observatory with up to $\sim 20 \;\%$.
High Energy Astrophysical Phenomena Astrophysics of Galaxies
1 code implementation • 17 Dec 2020 • Nicolas Martinet, Tiago Castro, Joachim Harnois-Déraps, Eric Jullo, Carlo Giocoli, Klaus Dolag
However, baryons need to be accounted for at the percentage level for future Stage IV surveys and we propose to include the uncertainty on the AGN feedback amplitude by marginalizing over this parameter using multiple simulations such as those presented in this paper.
Cosmology and Nongalactic Astrophysics
no code implementations • 4 Dec 2020 • Joachim Harnois-Déraps, Nicolas Martinet, Tiago Castro, Klaus Dolag, Benjamin Giblin, Catherine Heymans, Hendrik Hildebrandt, Qianli Xia
With mock DES-Y1 data we calibrate the impact of photometric redshift and shear calibration uncertainty on the peak-count, marginalising over these uncertainties in our cosmological analysis.
Cosmology and Nongalactic Astrophysics
no code implementations • 8 Oct 2020 • Yuyu Wang, Nesar Ramachandra, Edgar M. Salazar-Canizales, Hume A. Feldman, Richard Watkins, Klaus Dolag
The Sunyaev-Zel'dolvich (SZ) effect is expected to be instrumental in measuring velocities of distant clusters in near future telescope surveys.
Cosmology and Nongalactic Astrophysics
no code implementations • 7 Jan 2020 • Dhayaa Anbajagane, August E. Evrard, Arya Farahi, David J. Barnes, Klaus Dolag, Ian G. McCarthy, Dylan Nelson, Annalisa Pillepich
The highest resolution simulations find $\gamma \simeq -0. 8$ for the $z=0$ shape of $p(\ln M_{\star,\rm BCG}\,|\, M_{\rm halo}, z)$ and also that the fractional scatter in total stellar mass is below $10\%$ in halos more massive than $10^{14. 3} M_{\odot}$.
Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics
no code implementations • 7 Aug 2019 • Sheridan B. Green, Michelle Ntampaka, Daisuke Nagai, Lorenzo Lovisari, Klaus Dolag, Dominique Eckert, John A. ZuHone
This procedure is performed for two different mock observation series in an effort to bracket the potential enhancement in mass predictions that can be made possible by including dynamical state information.
Cosmology and Nongalactic Astrophysics
no code implementations • 29 Sep 2003 • Klaus Dolag, Matthias Bartelmann, Francesca Perrotta, Carlo Baccigalupi, Lauro Moscardini, Massimo Meneghetti, Giuseppe Tormen
We study the concentration parameters, their mass dependence and redshift evolution, of dark-matter halos in different dark-energy cosmologies with constant and time-variable equation of state, and compare them with "standard'' Lambda-CDM and OCDM models.