Theoretical accuracy in cosmological growth estimation

Benjamin Bose, Kazuya Koyama, Wojciech A. Hellwing, Gong-Bo Zhao, Hans A. Winther

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We elucidate the importance of the consistent treatment of gravity-model specific non-linearities when estimating the growth of cosmological structures from redshift space distortions (RSD). Within the context of standard perturbation theory (SPT), we compare the predictions of two theoretical templates with redshift space data from COLA (COmoving Lagrangian Acceleration) simulations in the normal branch of DGP gravity (nDGP) and General Relativity (GR). Using COLA for these comparisons is validated using a suite of full N-body simulations for the same theories. The two theoretical templates correspond to the standard general relativistic perturbation equations and those same equations modelled within nDGP. Gravitational clustering non-linear effects are accounted for by modelling the power spectrum up to one loop order and redshift space clustering anisotropy is modelled using the Taruya, Nishimichi and Saito (TNS) RSD model. Using this approach, we attempt to recover the simulation's fiducial logarithmic growth parameter ƒ. By assigning the simulation data with errors representing an idealised survey with a volume of 10Gpc3/h3, we find the GR template is unable to recover fiducial ƒ to within 1σ at z=1 when we match the data up to kmax=0.195h/Mpc. On the other hand, the DGP template recovers the fiducial value within 1σ. Further, we conduct the same analysis for sets of mock data generated for generalised models of modified gravity using SPT, where again we analyse the GR template's ability to recover the fiducial value. We find that for models with enhanced gravitational non-linearity, the theoretical bias of the GR template becomes significant for stage IV surveys. Thus, we show that for the future large data volume galaxy surveys, the self-consistent modelling of non-GR gravity scenarios will be crucial in constraining theory parameters.
Original languageEnglish
JournalPhysical Review D
Issue number2
Publication statusPublished - 18 Jul 2017


  • astro-ph.CO
  • RCUK
  • STFC
  • ST/N000668/1


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