Observatorio de I+D+i UPM

Memorias de investigación
Artículos en revistas:
Comparing approximate methods for mock catalogues and covariance matrices II: power spectrum multipoles
Año:2019
Áreas de investigación
  • Universo,
  • Metodos de analisis de datos
Datos
Descripción
We study the accuracy of several approximate methods for gravitational dynamics in terms of halo power spectrum multipoles and their estimated covariance matrix. We propagate the differences in covariances into parameter constraints related to growth rate of structure, Alcock?Paczynski distortions, and biasing. We consider seven methods in three broad categories: algorithms that solve for halo density evolution deterministically using Lagrangian trajectories (ICE?COLA, PINOCCHIO, and PEAKPATCH), methods that rely on halo assignment schemes on to dark matter overdensities calibrated with a target N-body run (HALOGEN, PATCHY), and two standard assumptions about the full density probability distribution function (Gaussian and lognormal). We benchmark their performance against a set of three hundred N-body simulations, running similar sets of approximate simulations with matched initial conditions, for each method. We find that most methods reproduce the monopole to within 5 per cent, while residuals for the quadrupole are sometimes larger and scale dependent. The variance of the multipoles is typically reproduced within 10 per cent. Overall, we find that covariances built from approximate simulations yield errors on model parameters within 10 per cent of those from the N-body-based covariance
Internacional
Si
JCR del ISI
Si
Título de la revista
Monthly Notices of the Royal Astronomical Society
ISSN
0035-8711
Factor de impacto JCR
5,356
Información de impacto
Volumen
485
DOI
10.1093/mnras/stz507
Número de revista
2
Desde la página
1
Hasta la página
19
Mes
SIN MES
Ranking
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Participantes
  • Autor: Gustavo Yepes Alonso (UPM)
  • Autor: L Blot
  • Autor: M Crocce
  • Autor: e Sefusatti
  • Autor: M Lippich
  • Autor: M Colavincenzo
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Centro o Instituto I+D+i: Centro de Investigación en Simulación Computacional
S2i 2022 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
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