# Super-Sample Signal

@article{Li2014SuperSampleS, title={Super-Sample Signal}, author={Yin Li and Wayne Hu and Masahiro Takada}, journal={Physical Review D}, year={2014}, volume={90}, pages={103530} }

When extracting cosmological information from power spectrum measurements, we must consider the impact of super-sample density fluctuations whose wavelengths are larger than the survey scale. These modes contribute to the mean density fluctuation $\delta_b$ in the survey and change the power spectrum in the same way as a change in the cosmological background. They can be simply included in cosmological parameter estimation and forecasts by treating $\delta_b$ as an additional cosmological…

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## References

SHOWING 1-10 OF 77 REFERENCES

Power spectrum super-sample covariance

- Physics
- 2013

We provide a simple, unified approach to describing the impact of super-sample covariance, or beat coupling, on power spectrum estimation in a finite-volume survey. For a wide range of survey…

Super-Sample Covariance in Simulations

- Physics
- 2014

Using separate universe simulations, we accurately quantify super-sample covariance (SSC), the typically dominant sampling error for matter power spectrum estimators in a finite volume, which arises…

Sample Variance Considerations for Cluster Surveys

- Physics
- 2002

We present a general statistical framework for describing the effect of sample variance in the number counts of virialized objects and examine its effect on cosmological parameter estimation.…

The impact of non‐Gaussian errors on weak lensing surveys

- Physics
- 2008

The weak lensing power spectrum carries cosmological information via its dependence on the growth of structure and on geometric factors. Since much of the cosmological information comes from scales…

Thinking outside the box: effects of modes larger than the survey on matter power spectrum covariance

- Physics
- 2012

Accurate power spectrum (or correlation function) covariance matrices are a crucial requirement for cosmological parameter estimation from large scale structure surveys. In order to minimize reliance…

Cosmology and the Bispectrum

- Physics
- 2006

The present spatial distribution of galaxies in the Universe is non-Gaussian, with 40% skewness in 50 h{sup -1} Mpc spheres, and remarkably little is known about the information encoded in it about…

Joint analysis of cluster number counts and weak lensing power spectrum to correct for the super-sample covariance

- Physics
- 2014

A coherent over- or under-density contrast across a finite survey volume causes an upward- or downward-fluctuation in the observed number of halos. This fluctuation in halo number adds a significant…

Power Spectrum Correlations Induced by Nonlinear Clustering

- Physics
- 1999

Gravitational clustering is an intrinsically nonlinear process that generates significant non-Gaussian signatures in the density field. We consider how these affect power spectrum determinations from…

Joint likelihood function of cluster number counts and weak lensing power spectrum

- Physics
- 2013

A coherent over- or under-density contrast across a finite survey volume causes an upward- or downward- fluctuation in the number of halos. This fluctuation in halo number adds a significant…

SIMULATIONS OF WIDE-FIELD WEAK LENSING SURVEYS. I. BASIC STATISTICS AND NON-GAUSSIAN EFFECTS

- Physics
- 2009

We study the lensing convergence power spectrum and its covariance for a standard ΛCDM cosmology. We run 400 cosmological N-body simulations and use the outputs to perform a total of 1000 independent…