Autor(es)

Gordon, Jonathan ; de Aguiar, Bernardo F. ; Reboucas, Joao ; Brando, Guilherme ; Falciano, Felipe ; Miranda, Vivian ; Koyama, Kazuya ; Winther, Hans A.

• Tipo de documento: Artigo Científico
• Fonte: PHYSICAL REVIEW D; v. 110, n. 8, p. 32-pg., 2024-10-24.

Resumo

Year 1 results of the Legacy Survey of Space and Time (LSST) will provide tighter constraints on smallscale cosmology, beyond the validity of linear perturbation theory. This heightens the demand for a computationally affordable prescription that can accurately capture nonlinearities in beyond-ACDM models. The comoving Lagrangian acceleration (COLA) method, a cost-effective N-body technique, has been proposed as a viable alternative to high-resolution N-body simulations for training emulators of the nonlinear matter power spectrum. In this study, we evaluate this approach by employing COLA emulators to conduct a cosmic shear analysis with LSST-Y1 simulated data across three different nonlinear scale cuts. We use the w CDM model, for which the E uclid E mulator2 (EE2) exists as a benchmark, having been trained with high-resolution N-body simulations. We primarily utilize COLA simulations with mass resolution M part 8 x 10 10 h - 1 M circle dot and force resolution force = 0.5h-1 Mpc, though we also test refined settings with M part 1 x 10 10 h - 1 M circle dot and force resolution force = 0.17h-1 Mpc. We find the performance of the COLA emulators is sensitive to the placement of high-resolution N-body reference samples inside the prior, which only ensure agreement in their local vicinity. However, the COLA emulators pass stringent criteria in goodness of fit and parameter bias throughout the prior, when existing high-resolution ACDM emulators are leveraged alongside the COLA emulators to predict the respective ACDM parameters, suggesting a promising template for extensions to ACDM. (AU)

• Processo FAPESP: 20/03756-2 - Testando Física fundamental com grandes levantamentos cosmológicos
• Beneficiário: João Victor Silva Rebouças
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto