Corpus ID: 235293918

Cosmological Simulations of Number Counts

@inproceedings{Lepori2021CosmologicalSO,
  title={Cosmological Simulations of Number Counts},
  author={Francesca Lepori and J. Adamek and R. Durrer},
  year={2021}
}
In this paper we present for the first time the angular power spectra C`(z, z′) for number counts from relativistic N-body simulations. We use the relativistic N-body code gevolution with its exact integration of lightlike geodesics which include all relativistic scalar contributions to the number counts. We compare our non-perturbative numerical results with the results from class using the Halofit approximation for the non-linear matter power spectrum. We find that the Halofit approximation… Expand

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References

SHOWING 1-10 OF 66 REFERENCES
Revising the Halofit Model for the Nonlinear Matter Power Spectrum
Based on a suite of state-of-the-art high-resolution N-body simulations, we revisit the so-called halofit model as an accurate fitting formula for the nonlinear matter power spectrum. While theExpand
Fast estimation of polarization power spectra using correlation functions
We present a fast method for estimating the cosmic microwave background polarization power spectra using unbiased estimates of heuristically weighted correlation functions. This extends the O(N 3/2Expand
Detection of cosmic magnification via galaxy shear-galaxy number density correlation from HSC survey data
Xiangkun Liu, ∗ Dezi Liu, Zucheng Gao, Chengliang Wei, Guoliang Li, 4 Liping Fu, Toshifumi Futamase, and Zuhui Fan † South-Western Institute for Astronomy Research, Yunnan University, Kunming 650500,Expand
Beware of commonly used approximations
  • Part I. Errors in forecasts, JCAP 10
  • 2020
Beware of commonly used approximations. Part I. Errors in forecasts
In the era of precision cosmology, establishing the correct magnitude of statistical errors in cosmological parameters is of crucial importance. However, widely used approximations in galaxy surveysExpand
Modeling relativistic contributions to the halo power spectrum dipole
We study the power spectrum dipole of an N-body simulation which includes relativistic effects through ray-tracing and covers the low redshift Universe up to $z_{\rm max} = 0.465$ (RayGalGroupExpand
Nonlinear contributions to angular power spectra
Future galaxy clustering surveys will probe small scales where non-linearities become important. Since the number of modes accessible on intermediate to small scales is very high, having a preciseExpand
Nonlinear redshift-space distortions in the harmonic-space galaxy power spectrum
Future high spectroscopic resolution galaxy surveys will observe galaxies with nearly full-sky footprints. Modeling the galaxy clustering for these surveys, therefore, must include the wide-angleExpand
Observing relativistic features in large-scale structure surveys – I. Multipoles of the power spectrum
Planned efforts to probe the largest observable distance scales in future cosmological surveys are motivated by a desire to detect relic correlations left over from inflation, and the possibility ofExpand
Observing relativistic features in large-scale structure surveys – II. Doppler magnification in an ensemble of relativistic simulations
The standard cosmological model is inherently relativistic, and yet a wide range of cosmological observations can be predicted accurately from essentially Newtonian theory. This is not the case onExpand
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