Validation of the scientific program for the Dark Energy Spectroscopic Instrument

AG Adame, J Aguilar, S Ahlen, S Alam… - The Astronomical …, 2024 - iopscience.iop.org
Studies of the geometry and energy content of the Universe, physics of cosmic expansion,
fundamental properties of standard model particles, and growth of structure remain the key …

PNG-UNITsims: Halo clustering response to primordial non-Gaussianities as a function of mass

AG Adame, S Avila, V Gonzalez-Perez… - Astronomy & …, 2024 - aanda.org
This paper presents the PNG-UNITSIMS suite, which includes the largest full N-body
simulation to date with local primordial non-Gaussianities (local PNG), the PNG-UNIT. The …

Precision redshift-space galaxy power spectra using Zel'dovich control variates

J DeRose, SF Chen, N Kokron… - Journal of Cosmology and …, 2023 - iopscience.iop.org
Numerical simulations in cosmology require trade-offs between volume, resolution and run-
time that limit the volume of the Universe that can be simulated, leading to sample variance …

The MillenniumTNG Project: the large-scale clustering of galaxies

S Bose, B Hadzhiyska, M Barrera… - Monthly Notices of …, 2023 - academic.oup.com
Modern redshift surveys are tasked with mapping out the galaxy distribution over enormous
distance scales. Existing hydrodynamical simulations, however, do not reach the volumes …

DESI mock challenge-Halo and galaxy catalogues with the bias assignment method

A Balaguera-Antolínez, FS Kitaura, S Alam… - Astronomy & …, 2023 - aanda.org
Context. We present a novel approach to the construction of mock galaxy catalogues for
large-scale structure analysis based on the distribution of dark matter halos obtained with …

Mitigating the noise of DESI mocks using analytic control variates

B Hadzhiyska, MJ White, X Chen, LH Garrison… - arXiv preprint arXiv …, 2023 - arxiv.org
In order to address fundamental questions related to the expansion history of the Universe
and its primordial nature with the next generation of galaxy experiments, we need to model …

Accurate predictions from small boxes: variance suppression via the Zel'dovich approximation

N Kokron, SF Chen, M White, J DeRose… - Journal of Cosmology …, 2022 - iopscience.iop.org
Simulations have become an indispensable tool for accurate modelling of observables
measured in galaxy surveys, but can be expensive if very large dynamic range in scale is …

Covariance matrices for the Lyman-α forest using the lognormal approximation

B Arya, A Paranjape… - Journal of Cosmology and …, 2024 - iopscience.iop.org
We investigate the nature of correlations in the small-scale flux statistics of the Lyman-α
(Lyα) forest across redshift bins. Understanding and characterising these correlations is …

Comparing Compressed and Full-modeling Analyses with FOLPS: Implications for DESI 2024 and beyond

HE Noriega, A Aviles, H Gil-Marín… - arXiv preprint arXiv …, 2024 - arxiv.org
The Dark Energy Spectroscopic Instrument (DESI) will provide unprecedented information
about the large-scale structure of our Universe. In this work, we study the robustness of the …

A modified lognormal approximation of the Lyman-α forest: comparison with full hydrodynamic simulations at 2≤ z≤ 2.7

B Arya, TR Choudhury, A Paranjape… - Journal of Cosmology …, 2024 - iopscience.iop.org
Observations of the Lyman-α forest in distant quasar spectra with upcoming surveys are
expected to provide significantly larger and higher-quality datasets. To interpret these …