dorsal/arxiv
View SchemaSahyadri: A simulation suite for the cosmology dependence of the Cosmic Web
| Authors | Saee Dhawalikar, Shadab Alam, Aseem Paranjape, Arka Banerjee |
|---|---|
| Categories | |
| ArXiv ID | 2601.07924vv1 |
| URL | https://arxiv.org/abs/2601.07924 |
| License | http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
Abstract
We present Sahyadri, a suite of cosmological $N$-body simulations designed to enable precision studies of the low-redshift Universe with next-generation spectroscopic surveys. Sahyadri includes systematic variations of six cosmological parameters around Planck 2018 constraints, with seed-matched initial conditions enabling cosmological parameter derivatives. Each simulation evolves $2048^3$ particles in a periodic box of side length $200$ $h^{-1}$ Mpc, yielding a particle mass of $m_{\rm{p}} = 8.1 \times 10^{7}\,h^{-1}\,M_{\odot}$ in the fiducial Planck 2018 cosmology. This resolution enables robust identification of dark matter halos down to $M_{\rm min} = 3.2 \times 10^{9}$ $h^{-1}$ $M_\odot$, which represents a factor of $\sim$25 improvement over the AbacusSummit suite, and is over two orders of magnitude better than the Quijote and Aemulus suites. We estimate that approximately 40% of DESI BGS galaxies at redshift $z < 0.15$ - roughly 1.6 million objects - reside in halos accessible to Sahyadri but beyond the reach of existing parameter-varying simulation suites. We demonstrate Sahyadri's capabilities through measurements of the matter power spectrum, halo mass function and power spectrum, and beyond 2-point statistics such as the Voronoi volume function and $k^{\rm th}$ nearest neighbour statistics, showing excellent agreement with theoretical predictions and significant sensitivity to $\Omega_{\rm m}$ variations. We implement a custom compression scheme reducing storage requirements by a factor of $\sim$3 while maintaining sub-percent clustering accuracy. Key data products will be made publicly available.
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"abstract": "We present Sahyadri, a suite of cosmological $N$-body simulations designed to enable precision studies of the low-redshift Universe with next-generation spectroscopic surveys. Sahyadri includes systematic variations of six cosmological parameters around Planck 2018 constraints, with seed-matched initial conditions enabling cosmological parameter derivatives. Each simulation evolves $2048^3$ particles in a periodic box of side length $200$ $h^{-1}$ Mpc, yielding a particle mass of $m_{\\rm{p}} = 8.1 \\times 10^{7}\\,h^{-1}\\,M_{\\odot}$ in the fiducial Planck 2018 cosmology. This resolution enables robust identification of dark matter halos down to $M_{\\rm min} = 3.2 \\times 10^{9}$ $h^{-1}$ $M_\\odot$, which represents a factor of $\\sim$25 improvement over the AbacusSummit suite, and is over two orders of magnitude better than the Quijote and Aemulus suites. We estimate that approximately 40% of DESI BGS galaxies at redshift $z \u003c 0.15$ - roughly 1.6 million objects - reside in halos accessible to Sahyadri but beyond the reach of existing parameter-varying simulation suites. We demonstrate Sahyadri\u0027s capabilities through measurements of the matter power spectrum, halo mass function and power spectrum, and beyond 2-point statistics such as the Voronoi volume function and $k^{\\rm th}$ nearest neighbour statistics, showing excellent agreement with theoretical predictions and significant sensitivity to $\\Omega_{\\rm m}$ variations. We implement a custom compression scheme reducing storage requirements by a factor of $\\sim$3 while maintaining sub-percent clustering accuracy. Key data products will be made publicly available.",
"arxiv_id": "2601.07924",
"authors": [
"Saee Dhawalikar",
"Shadab Alam",
"Aseem Paranjape",
"Arka Banerjee"
],
"categories": [
"astro-ph.CO"
],
"license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
"title": "Sahyadri: A simulation suite for the cosmology dependence of the Cosmic Web",
"url": "https://arxiv.org/abs/2601.07924",
"version": "v1"
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