Corpus ID: 235694705

Small scale effects in the observable power spectrum at large angular scales

@inproceedings{Matthewson2021SmallSE,
  title={Small scale effects in the observable power spectrum at large angular scales},
  author={William L. Matthewson and Ruth Durrer},
  year={2021}
}
In this paper we show how effects from small scales enter the angular-redshift power spectrum C`(z, z ′). In particular, we show that spectroscopic surveys with high redshift resolution are affected by small scales already on large angular scales, i.e. at low multipoles. Therefore, when considering the angular power spectrum with spectroscopic redshift resolution, it is important to account for non-linearities relevant on small scales even at low multipoles. This may also motivate the use of… Expand
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References

SHOWING 1-10 OF 19 REFERENCES
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
The full-sky relativistic correlation function and power spectrum of galaxy number counts. Part I: theoretical aspects
We derive an exact expression for the correlation function in redshift shells including all the relativistic contributions. This expression, which does not rely on the distant-observer or flat-skyExpand
The full-sky angular bispectrum in redshift space
We compute the redshift-dependent angular bispectrum of galaxy number counts at tree-level, including nonlinear clustering bias and estimating numerically for the first time the effect of redshiftExpand
Cosmological Parameter Estimation with Large Scale Structure Observations
We estimate the sensitivity of future galaxy surveys to cosmological parameters, using the redshift dependent angular power spectra of galaxy number counts, C-l(z(1), z(2)), calculated with allExpand
The linear power spectrum of observed source number counts
We relate the observable number of sources per solid angle and redshift to the underlying proper source density and velocity, background evolution and line-of-sight potentials. We give an exactExpand
Ultra large-scale cosmology in next-generation experiments with single tracers
Future surveys of large-scale structure will be able to measure perturbations on the scale of the cosmological horizon, and so could potentially probe a number of novel relativistic effects that areExpand
Large-scale clustering of galaxies in general relativity
Several recent studies have shown how to properly calculate the observed clustering of galaxies in a relativistic context, and uncovered corrections to the Newtonian calculation that becomeExpand
Impact of relativistic effects on cosmological parameter estimation
Future surveys will access large volumes of space and hence very long wavelength fluctuations of the matter density and gravitational field. It has been argued that the set of secondary effects thatExpand
The flat-sky approximation to galaxy number counts — redshift space correlation function
We study the flat-sky approximation for galaxy number counts including relativistic effects, and numerically assess its performance and accuracy with respect to the full-sky result. We find anExpand
The CLASSgal code for relativistic cosmological large scale structure
We present accurate and efficient computations of large scale structure observables, obtained with a modified version of the c l ass code which is made publicly available. This code includes allExpand
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