Imagen de Portada

Emulating galaxy and peculiar velocity clustering on non-linear scales

Fuente: arXiv

Guardado en:

Detalles Bibliográficos
Autores principales:	Dumerchat, T., Bautista, J., Ravoux, C., Aguilar, J., Ahlen, S., BenZvi, S., Bianchi, D., Brooks, D., Claybaugh, T., de la Macorra, A., Doel, P., Ferraro, S., Forero-Romero, J. E., Gaztañaga, E., Gontcho, S. Gontcho A, Gutierrez, G., Hahn, C., Howlett, C., Ishak, M., Joyce, R., Kirkby, D., Kremin, A., Lamman, C., Landriau, M., Guillou, L. Le, Manera, M., Miquel, R., Nadathur, S., Percival, W. J., Prada, F., Pérez-Ràfols, I., Rossi, G., Sanchez, E., Schlegel, D., Schubnell, M., Silber, J., Sprayberry, D., Tarlé, G., Weaver, B. A., Zou, H.
Formato:	Preprint
Publicado:	2026
Materias:	Cosmology and Nongalactic Astrophysics
Acceso en línea:	Acceder al recurso
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

_version_	1866908808205303808
author	Dumerchat, T. Bautista, J. Ravoux, C. Aguilar, J. Ahlen, S. BenZvi, S. Bianchi, D. Brooks, D. Claybaugh, T. de la Macorra, A. Doel, P. Ferraro, S. Forero-Romero, J. E. Gaztañaga, E. Gontcho, S. Gontcho A Gutierrez, G. Hahn, C. Howlett, C. Ishak, M. Joyce, R. Kirkby, D. Kremin, A. Lamman, C. Landriau, M. Guillou, L. Le Manera, M. Miquel, R. Nadathur, S. Percival, W. J. Prada, F. Pérez-Ràfols, I. Rossi, G. Sanchez, E. Schlegel, D. Schubnell, M. Silber, J. Sprayberry, D. Tarlé, G. Weaver, B. A. Zou, H.
author_facet	Dumerchat, T. Bautista, J. Ravoux, C. Aguilar, J. Ahlen, S. BenZvi, S. Bianchi, D. Brooks, D. Claybaugh, T. de la Macorra, A. Doel, P. Ferraro, S. Forero-Romero, J. E. Gaztañaga, E. Gontcho, S. Gontcho A Gutierrez, G. Hahn, C. Howlett, C. Ishak, M. Joyce, R. Kirkby, D. Kremin, A. Lamman, C. Landriau, M. Guillou, L. Le Manera, M. Miquel, R. Nadathur, S. Percival, W. J. Prada, F. Pérez-Ràfols, I. Rossi, G. Sanchez, E. Schlegel, D. Schubnell, M. Silber, J. Sprayberry, D. Tarlé, G. Weaver, B. A. Zou, H.
contents	We explore the potential of cross-correlating galaxies and peculiar velocities on non-linear scales to enhance cosmological constraints. Leveraging the \textsc{AbacusSummit} simulation suite and the halo occupation distribution (HOD) formalism, we train emulator models to describe the non-linear clustering of galaxies and velocities in redshift space. Our analysis demonstrates that combining galaxy and peculiar velocity clustering, provides tighter constraints on both HOD and cosmological parameters, particularly on $σ_8$ and $w_0$. We further apply our models to realistic mock catalogues, reproducing the expected density and peculiar velocity errors of type-Ia supernovae and Tully-Fisher/fundamental plane measurements for the combined ZTF and DESI measurements. While systematic biases arise in the HOD parameters, the cosmological constraints remain unbiased, yielding $3.8\%$ precision measurement on $fσ_8$ compared to $4.7\%$ using galaxy clustering alone. We demonstrate that, while combining tracers with realistic velocity measurements still yields improvement, the gains are diminished, highlighting the need for further efforts to reduce velocity measurement uncertainties and correct observational systematics on small scales.
format	Preprint
id	arxiv_https___arxiv_org_abs_2602_03382
institution	arXiv
publishDate	2026
record_format	arxiv
spellingShingle	Emulating galaxy and peculiar velocity clustering on non-linear scales Dumerchat, T. Bautista, J. Ravoux, C. Aguilar, J. Ahlen, S. BenZvi, S. Bianchi, D. Brooks, D. Claybaugh, T. de la Macorra, A. Doel, P. Ferraro, S. Forero-Romero, J. E. Gaztañaga, E. Gontcho, S. Gontcho A Gutierrez, G. Hahn, C. Howlett, C. Ishak, M. Joyce, R. Kirkby, D. Kremin, A. Lamman, C. Landriau, M. Guillou, L. Le Manera, M. Miquel, R. Nadathur, S. Percival, W. J. Prada, F. Pérez-Ràfols, I. Rossi, G. Sanchez, E. Schlegel, D. Schubnell, M. Silber, J. Sprayberry, D. Tarlé, G. Weaver, B. A. Zou, H. Cosmology and Nongalactic Astrophysics We explore the potential of cross-correlating galaxies and peculiar velocities on non-linear scales to enhance cosmological constraints. Leveraging the \textsc{AbacusSummit} simulation suite and the halo occupation distribution (HOD) formalism, we train emulator models to describe the non-linear clustering of galaxies and velocities in redshift space. Our analysis demonstrates that combining galaxy and peculiar velocity clustering, provides tighter constraints on both HOD and cosmological parameters, particularly on $σ_8$ and $w_0$. We further apply our models to realistic mock catalogues, reproducing the expected density and peculiar velocity errors of type-Ia supernovae and Tully-Fisher/fundamental plane measurements for the combined ZTF and DESI measurements. While systematic biases arise in the HOD parameters, the cosmological constraints remain unbiased, yielding $3.8\%$ precision measurement on $fσ_8$ compared to $4.7\%$ using galaxy clustering alone. We demonstrate that, while combining tracers with realistic velocity measurements still yields improvement, the gains are diminished, highlighting the need for further efforts to reduce velocity measurement uncertainties and correct observational systematics on small scales.
title	Emulating galaxy and peculiar velocity clustering on non-linear scales
topic	Cosmology and Nongalactic Astrophysics
url	https://arxiv.org/abs/2602.03382