CosmoMIA: Cosmic Web-based redshift space halo distribution
Fuente:
arXiv
Enregistré dans:
| Auteurs principaux: | , , , , |
|---|---|
| Format: | Preprint |
| Publié: |
2024
|
| Sujets: | |
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1866913343067914240 |
|---|---|
| author | Forero-Sánchez, Daniel Kitaura, Francisco-Shu Sinigaglia, Francesco Coloma-Nadal, Jose María Kneib, Jean-Paul |
| author_facet | Forero-Sánchez, Daniel Kitaura, Francisco-Shu Sinigaglia, Francesco Coloma-Nadal, Jose María Kneib, Jean-Paul |
| contents | Modern galaxy surveys demand extensive survey volumes and resolutions surpassing current dark matter-only simulations' capabilities. To address this, many methods employ effective bias models on the dark matter field to approximate object counts on a grid. However, realistic catalogs necessitate specific coordinates and velocities for a comprehensive understanding of the Universe. In this research, we explore sub-grid modeling to create accurate catalogs, beginning with coarse grid number counts at resolutions of approximately $5.5\,h^{-1}\rm Mpc$ per side. These resolutions strike a balance between modeling nonlinear damping of baryon acoustic oscillations and facilitating large-volume simulations. Augmented Lagrangian Perturbation Theory (ALPT) is utilized to model the dark matter field and motions, replicating the clustering of a halo catalog derived from a massive simulation at $z=1.1$. Our approach involves four key stages:
Tracer Assignment: Allocating dark matter particles to tracers based on grid cell counts, generating additional particles to address discrepancies.
Attractor Identification: Defining attractors based on particle cosmic web environments, acting as gravitational focal points.
Tracer Collapse: Guiding tracers towards attractors, simulating structure collapse.
Redshift Space Distortions: Introducing redshift space distortions to simulated catalogs using ALPT and a random dispersion term.
Results demonstrate accurate reproduction of monopoles and quadrupoles up to wave numbers of approximately $k=0.6\,h$ Mpc$^{-1}$. This method holds significant promise for galaxy surveys like DESI, EUCLID, and LSST, enhancing our understanding of the cosmos across scales. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_17581 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | CosmoMIA: Cosmic Web-based redshift space halo distribution Forero-Sánchez, Daniel Kitaura, Francisco-Shu Sinigaglia, Francesco Coloma-Nadal, Jose María Kneib, Jean-Paul Cosmology and Nongalactic Astrophysics Modern galaxy surveys demand extensive survey volumes and resolutions surpassing current dark matter-only simulations' capabilities. To address this, many methods employ effective bias models on the dark matter field to approximate object counts on a grid. However, realistic catalogs necessitate specific coordinates and velocities for a comprehensive understanding of the Universe. In this research, we explore sub-grid modeling to create accurate catalogs, beginning with coarse grid number counts at resolutions of approximately $5.5\,h^{-1}\rm Mpc$ per side. These resolutions strike a balance between modeling nonlinear damping of baryon acoustic oscillations and facilitating large-volume simulations. Augmented Lagrangian Perturbation Theory (ALPT) is utilized to model the dark matter field and motions, replicating the clustering of a halo catalog derived from a massive simulation at $z=1.1$. Our approach involves four key stages: Tracer Assignment: Allocating dark matter particles to tracers based on grid cell counts, generating additional particles to address discrepancies. Attractor Identification: Defining attractors based on particle cosmic web environments, acting as gravitational focal points. Tracer Collapse: Guiding tracers towards attractors, simulating structure collapse. Redshift Space Distortions: Introducing redshift space distortions to simulated catalogs using ALPT and a random dispersion term. Results demonstrate accurate reproduction of monopoles and quadrupoles up to wave numbers of approximately $k=0.6\,h$ Mpc$^{-1}$. This method holds significant promise for galaxy surveys like DESI, EUCLID, and LSST, enhancing our understanding of the cosmos across scales. |
| title | CosmoMIA: Cosmic Web-based redshift space halo distribution |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2402.17581 |