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Title: The Borg Cube Simulation: Cosmological Hydrodynamics with CRK-SPH

Abstract

A challenging requirement posed by next-generation observations is a firm theoretical grasp of the impact of baryons on structure formation. Cosmological hydrodynamic simulations modeling gas physics are vital in this regard. A high degree of modeling flexibility exists in this space, making it important to explore a range of methods in order to gauge the accuracy of simulation predictions. We present results from the first cosmological simulation using Conservative Reproducing Kernel Smoothed Particle Hydrodynamics (CRK-SPH). We employ two simulations: one evolved purely under gravity, and the other with nonradiative hydrodynamics Each contains 2 x 2304(3) cold dark matter plus baryon particles in an 800 h(-1) Mpc box. We compare statistics to previous nonradiative simulations including power spectra, mass functions, baryon fractions, and concentration. We find self-similar radial profiles of gas temperature, entropy, and pressure and show that a simple analytic model recovers these results to better than 40% over two orders of magnitude in mass. We quantify the level of nonthermal pressure support in halos and demonstrate that hydrostatic mass estimates are biased low by 24% (10%) for halos of mass 10(15) (10(13)) h(-1)M(circle dot). We compute angular power spectra for the thermal and kinematic Sunyaev-Zel'dovich effects and find goodmore » agreement with the low-l Planck measurements. Finally, artificial scattering between particles of unequal mass is shown to have a large impact on the gravity-only run, and we highlight the importance of better understanding this issue in hydrodynamic applications. This is the first in a simulation campaign using CRK-SPH, with future work including subresolution gas treatments.« less

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1542643
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 877; Journal Issue: 2
Country of Publication:
United States
Language:
English
Subject:
cosmology: theory; hydrodynamics; large-scale structure; methods: numerical

Citation Formats

Emberson, J. D., Frontiere, Nicholas, Habib, Salman, Heitmann, Katrin, Larsen, Patricia, Finkel, Hal, and Pope, Adrian. The Borg Cube Simulation: Cosmological Hydrodynamics with CRK-SPH. United States: N. p., 2019. Web. doi:10.3847/1538-4357/ab1b31.
Emberson, J. D., Frontiere, Nicholas, Habib, Salman, Heitmann, Katrin, Larsen, Patricia, Finkel, Hal, & Pope, Adrian. The Borg Cube Simulation: Cosmological Hydrodynamics with CRK-SPH. United States. doi:10.3847/1538-4357/ab1b31.
Emberson, J. D., Frontiere, Nicholas, Habib, Salman, Heitmann, Katrin, Larsen, Patricia, Finkel, Hal, and Pope, Adrian. Sat . "The Borg Cube Simulation: Cosmological Hydrodynamics with CRK-SPH". United States. doi:10.3847/1538-4357/ab1b31.
@article{osti_1542643,
title = {The Borg Cube Simulation: Cosmological Hydrodynamics with CRK-SPH},
author = {Emberson, J. D. and Frontiere, Nicholas and Habib, Salman and Heitmann, Katrin and Larsen, Patricia and Finkel, Hal and Pope, Adrian},
abstractNote = {A challenging requirement posed by next-generation observations is a firm theoretical grasp of the impact of baryons on structure formation. Cosmological hydrodynamic simulations modeling gas physics are vital in this regard. A high degree of modeling flexibility exists in this space, making it important to explore a range of methods in order to gauge the accuracy of simulation predictions. We present results from the first cosmological simulation using Conservative Reproducing Kernel Smoothed Particle Hydrodynamics (CRK-SPH). We employ two simulations: one evolved purely under gravity, and the other with nonradiative hydrodynamics Each contains 2 x 2304(3) cold dark matter plus baryon particles in an 800 h(-1) Mpc box. We compare statistics to previous nonradiative simulations including power spectra, mass functions, baryon fractions, and concentration. We find self-similar radial profiles of gas temperature, entropy, and pressure and show that a simple analytic model recovers these results to better than 40% over two orders of magnitude in mass. We quantify the level of nonthermal pressure support in halos and demonstrate that hydrostatic mass estimates are biased low by 24% (10%) for halos of mass 10(15) (10(13)) h(-1)M(circle dot). We compute angular power spectra for the thermal and kinematic Sunyaev-Zel'dovich effects and find good agreement with the low-l Planck measurements. Finally, artificial scattering between particles of unequal mass is shown to have a large impact on the gravity-only run, and we highlight the importance of better understanding this issue in hydrodynamic applications. This is the first in a simulation campaign using CRK-SPH, with future work including subresolution gas treatments.},
doi = {10.3847/1538-4357/ab1b31},
journal = {Astrophysical Journal},
number = 2,
volume = 877,
place = {United States},
year = {2019},
month = {6}
}

Journal Article:
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