Perturbation theory for modeling galaxy bias: Validation with simulations of the Dark Energy Survey

Pandey, S. and Krause, E and Jain, B and Desai, Shantanu (2020) Perturbation theory for modeling galaxy bias: Validation with simulations of the Dark Energy Survey. Physical Review D, 102 (12). pp. 1-18. ISSN 2470-0010

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We describe perturbation theory (PT) models of galaxy bias for applications to photometric galaxy surveys. We model the galaxy-galaxy and galaxy-matter correlation functions in configuration space and validate against measurements from mock catalogs designed for the Dark Energy Survey (DES). We find that an effective PT model with five galaxy bias parameters provides a good description of the 3D correlation functions above scales of 4 Mpc/h and z<1. Our tests show that at the projected precision of the DES Year 3 analysis, two of the nonlinear bias parameters can be fixed to their coevolution values, and a third (the k2 term for higher derivative bias) set to zero. The agreement is typically at the 2% level over scales of interest, which is the statistical uncertainty of our simulation measurements. To achieve this level of agreement, our fiducial model requires using the full nonlinear matter power spectrum (rather than the one-loop PT one). We also measure the relationship between the nonlinear and linear bias parameters and compare them to their expected coevolution values. We use these tests to motivate the galaxy bias model and scale cuts for the cosmological analysis of the Dark Energy Survey; our conclusions are generally applicable to all photometric surveys. © 2020 American Physical Society.

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IITH Creators:
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Desai, Shantanu
Item Type: Article
Additional Information: We thank Ravi Sheth for valuable discussions regarding nonlinear bias models and the formalism of the paper. S. P. and B. J. are supported in part by U.S. Department of Energy Grant No. DE-SC0007901. E. K. is supported by U.S. Department of Energy Grant No. DE-SC0020247. Funding for the DES Projects has been provided by the U.S. Department of Energy, the U.S. National Science Foundation, the Ministry of Science and Education of Spain, the Science and Technology Facilities Council of the United Kingdom, the Higher Education Funding Council for England, the National Center for Supercomputing Applications at the University of Illinois at Urbana-Champaign, the Kavli Institute of Cosmological Physics at the University of Chicago, the Center for Cosmology and Astro-Particle Physics at the Ohio State University, the Mitchell Institute for Fundamental Physics and Astronomy at Texas A&M University, Financiadora de Estudos e Projetos, Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado d ...
Uncontrolled Keywords: perturbation theory (PT),Dark Energy Survey (DES)
Subjects: Physics
Physics > Sound, light and Heat
Physics > Astronomy Astrophysics
Divisions: Department of Physics
Depositing User: . LibTrainee 2021
Date Deposited: 16 Nov 2022 06:23
Last Modified: 16 Nov 2022 06:23
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