HYMALAIA: A Hybrid Lagrangian Model for Intrinsic Alignments
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866910473455140864 |
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| author | Maion, Francisco Angulo, Raul E. Bakx, Thomas Chisari, Nora Elisa Kurita, Toshiki Pellejero-Ibáñez, Marcos |
| author_facet | Maion, Francisco Angulo, Raul E. Bakx, Thomas Chisari, Nora Elisa Kurita, Toshiki Pellejero-Ibáñez, Marcos |
| contents | The intrinsic alignment of galaxies is an important ingredient for modelling weak-lensing measurements, and a potentially valuable cosmological and astrophysical signal. In this paper, we present HYMALAIA: a new model to predict the intrinsic alignments of biased tracers. HYMALAIA is based on a perturbative expansion of the statistics of the Lagrangian shapes of objects, which is then advected to Eulerian space using the fully non-linear displacement field obtained from $N$-body simulations. We demonstrate that HYMALAIA is capable of consistently describing monopole and quadrupole of halo shape-shape and matter-shape correlators, and that, without increasing the number of free parameters, it does so more accurately than other perturbatively inspired models such as the non-linear alignment (NLA) model and the tidal-alignment-tidal-torquing (TATT) model. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2307_13754 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | HYMALAIA: A Hybrid Lagrangian Model for Intrinsic Alignments Maion, Francisco Angulo, Raul E. Bakx, Thomas Chisari, Nora Elisa Kurita, Toshiki Pellejero-Ibáñez, Marcos Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies The intrinsic alignment of galaxies is an important ingredient for modelling weak-lensing measurements, and a potentially valuable cosmological and astrophysical signal. In this paper, we present HYMALAIA: a new model to predict the intrinsic alignments of biased tracers. HYMALAIA is based on a perturbative expansion of the statistics of the Lagrangian shapes of objects, which is then advected to Eulerian space using the fully non-linear displacement field obtained from $N$-body simulations. We demonstrate that HYMALAIA is capable of consistently describing monopole and quadrupole of halo shape-shape and matter-shape correlators, and that, without increasing the number of free parameters, it does so more accurately than other perturbatively inspired models such as the non-linear alignment (NLA) model and the tidal-alignment-tidal-torquing (TATT) model. |
| title | HYMALAIA: A Hybrid Lagrangian Model for Intrinsic Alignments |
| topic | Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2307.13754 |