J. D. Emberson
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View article: A Gigaparsec-scale Hydrodynamic Volume Reconstructed with Deep Learning
A Gigaparsec-scale Hydrodynamic Volume Reconstructed with Deep Learning Open
The next generation of spectroscopic surveys will map the large-scale structure of the Universe at high redshifts (2 ≤ z ≤ 5) using millions of quasar spectra, enabling major advances in constraining both the standard cosmological model an…
View article: The picasso gas model: Painting intracluster gas on gravity-only simulations
The picasso gas model: Painting intracluster gas on gravity-only simulations Open
We introduce picasso , a model designed to predict thermodynamic properties of the intracluster medium based on the properties of halos in gravity-only simulations. The predictions result from the combination of an analytical gas model, ma…
View article: Advances in ArborX to support exascale applications
Advances in ArborX to support exascale applications Open
ArborX is a performance portable geometric search library developed as part of the Exascale Computing Project (ECP). In this paper, we explore a collaboration between ArborX and a cosmological simulation code HACC. Large cosmological simul…
View article: The picasso gas model: Painting intracluster gas on gravity-only simulations
The picasso gas model: Painting intracluster gas on gravity-only simulations Open
We introduce picasso, a model designed to predict thermodynamic properties of the intracluster medium based on the properties of halos in gravity-only simulations. The predictions result from the combination of an analytical gas model, map…
View article: Optimization and Quality Assessment of Baryon Pasting for Intracluster Gas using the Borg Cube Simulation
Optimization and Quality Assessment of Baryon Pasting for Intracluster Gas using the Borg Cube Simulation Open
Synthetic datasets generated from large-volume gravity-only simulations are an important tool in the calibration of cosmological analyses. Their creation often requires accurate inference of baryonic observables from the dark matter field.…
View article: Improving initialization and evolution accuracy of cosmological neutrino simulations
Improving initialization and evolution accuracy of cosmological neutrino simulations Open
Neutrino mass constraints are a primary focus of current and future large-scale structure (LSS) surveys. Non-linear LSS models rely heavily on cosmological simulations — the impact of massive neutrinos should therefore be included in these…
View article: Numerical discreteness errors in multispecies cosmological <i>N</i>-body simulations
Numerical discreteness errors in multispecies cosmological <i>N</i>-body simulations Open
We present a detailed analysis of numerical discreteness errors in two-species, gravity-only, cosmological simulations using the density power spectrum as a diagnostic probe. In a simple set-up where both species are initialized with the s…
View article: Simulating Hydrodynamics in Cosmology with CRK-HACC
Simulating Hydrodynamics in Cosmology with CRK-HACC Open
We introduce CRK-HACC, an extension of the Hardware/Hybrid Accelerated Cosmology Code (HACC), to resolve gas hydrodynamics in large-scale structure formation simulations of the universe. The new framework couples the HACC gravitational N -…
View article: sf-23-021 SONICC (SCALE-DEPENDENT OMEGA FOR NEUTRINO INITIAL CONDITION CODES)
sf-23-021 SONICC (SCALE-DEPENDENT OMEGA FOR NEUTRINO INITIAL CONDITION CODES) Open
SONICC computes density and velocity transfer functions for use in the initial conditions of massive neutrino cosmological simulations. The transfer functions are backscaled using a scale-dependent growth function that produces self-consis…
View article: Modelling the Lyman-α forest with Eulerian and SPH hydrodynamical methods
Modelling the Lyman-α forest with Eulerian and SPH hydrodynamical methods Open
We compare two state-of-the-art numerical codes to study the overall accuracy in modelling the intergalactic medium and reproducing Lyman-α forest observables for DESI and high-resolution data sets. The codes employ different approaches to…
View article: Measuring the evolution of intergalactic gas from <i>z</i> = 0 to 5 using the kinematic Sunyaev–Zel’dovich effect
Measuring the evolution of intergalactic gas from <i>z</i> = 0 to 5 using the kinematic Sunyaev–Zel’dovich effect Open
A complete census of baryons in the late Universe is a long-standing challenge due to the intermediate temperate and rarefied character of the majority of cosmic gas. To gain insight into this problem, we extract measurements of the kinema…
View article: Tomographic detection of the kinematic Sunyaev-Zel'dovich effect using angular redshift fluctuations
Tomographic detection of the kinematic Sunyaev-Zel'dovich effect using angular redshift fluctuations Open
Determining the large-scale distribution of baryons in the late universe is a long-standing challenge in cosmology. To gain insight into this problem, we present a new approach for extracting the kinematic Sunyaev-Zel'dovich (kSZ) effect f…
View article: On the road to per cent accuracy – III. Non-linear reaction of the matter power spectrum to massive neutrinos
On the road to per cent accuracy – III. Non-linear reaction of the matter power spectrum to massive neutrinos Open
We analytically model the non-linear effects induced by massive neutrinos on the total matter power spectrum using the halo model reaction framework of Cataneo et al. In this approach, the halo model is used to determine the relative chang…
View article: Next-Generation Cosmology Simulations with HACC: Conquering the Baryon Problem
Next-Generation Cosmology Simulations with HACC: Conquering the Baryon Problem Open
The next generation of cosmological surveys will start taking data in a few years. These surveys will cover the microwave, optical, and X-ray bands. A major challenge for the interpretation of these new observations will be to disentangle …
View article: Cosmological neutrino simulations at extreme scale
Cosmological neutrino simulations at extreme scale Open
Constraining neutrino mass remains an elusive challenge in modern physics. Precision measurements are expected from several upcoming cosmological probes of large-scale structure. Achieving this goal relies on an equal level of precision fr…
View article: Simulating the cold dark matter-neutrino dipole with TianNu
Simulating the cold dark matter-neutrino dipole with TianNu Open
Measurements of neutrino mass in cosmological observations rely on two point\nstatistics that are hindered by significant degeneracies with the optical depth\nand galaxy bias. The relative velocity effect between cold dark matter and\nneut…
View article: Precision reconstruction of the cold dark matter-neutrino relative velocity from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>N</mml:mi></mml:math>-body simulations
Precision reconstruction of the cold dark matter-neutrino relative velocity from-body simulations Open
Discovering the mass of neutrinos is a principle goal in high energy physics and cosmology. In addition to cosmological measurements based on two-point statistics, the neutrino mass can also be estimated by observations of neutrino wakes r…