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.
no code implementations • 15 Mar 2022 • Cora Dvorkin, Siddharth Mishra-Sharma, Brian Nord, V. Ashley Villar, Camille Avestruz, Keith Bechtol, Aleksandra Ćiprijanović, Andrew J. Connolly, Lehman H. Garrison, Gautham Narayan, Francisco Villaescusa-Navarro
Methods based on machine learning have recently made substantial inroads in many corners of cosmology.
4 code implementations • 15 Nov 2019 • Manodeep Sinha, Lehman H. Garrison
Corrfunc is an existing open-source, high-performance software package for efficiently computing a multitude of correlation functions.
Instrumentation and Methods for Astrophysics Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies Data Structures and Algorithms
4 code implementations • 8 Nov 2019 • Manodeep Sinha, Lehman H. Garrison
Since the distribution of galaxies is determined by galaxy formation physics as well as the underlying cosmology, fitting an observed correlation function yields valuable insights into both.
Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies Computational Physics
no code implementations • 23 Sep 2019 • Michelle Ntampaka, Daniel J. Eisenstein, Sihan Yuan, Lehman H. Garrison
We present a deep machine learning (ML)-based technique for accurately determining $\sigma_8$ and $\Omega_m$ from mock 3D galaxy surveys.
Cosmology and Nongalactic Astrophysics
1 code implementation • 27 Feb 2018 • Sihan Yuan, Daniel J. Eisenstein, Lehman H. Garrison
We identify generalized HOD prescriptions that are nearly degenerate in the projected 2PCF and demonstrate that these degeneracies are broken in the redshift-space anisotropic 2PCF and the squeezed 3PCF.
Cosmology and Nongalactic Astrophysics