Search Results for author: Lehman H. Garrison

Found 6 papers, 3 papers with code

Robust field-level inference with dark matter halos

no code implementations14 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.

Corrfunc: Blazing fast correlation functions with AVX512F SIMD Intrinsics

4 code implementations15 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

Corrfunc --- A Suite of Blazing Fast Correlation Functions on the CPU

4 code implementations8 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

A Hybrid Deep Learning Approach to Cosmological Constraints From Galaxy Redshift Surveys

no code implementations23 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

Exploring the squeezed three-point galaxy correlation function with generalized halo occupation distribution models

1 code implementation27 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

Cannot find the paper you are looking for? You can Submit a new open access paper.