Université de GenèveDépartement de Physique ThéoriqueCAP Genève

Cosmological Parameter Estimation with Large Scale Structure Observations

29. October 2013
Journal Club, DAMTP Cambridge

We estimate the sensitivity of future galaxy surveys to cosmological parameters, using the redshift dependent angular power spectra of galaxy number counts, Cl(z1,z2), calculated with all relativistic corrections at first order in perturbation theory. We pay special attention to the redshift dependence of the non-linearity scale and present Fisher matrix forecasts for Euclid-like galaxy survey. We show that for surveys with photometric redshifts the analysis with the redshift dependent angular power spectra performs significantly better than the usual analysis based on the three-dimensional matter power spectrum P(k,z). For spectroscopic redshifts, however, the large number of redshift bins needed to fully profit from the redshift information, leads to a significant degradation of the Cl(z1,z2) analysis due to shot noise. We also identify surveys that can measure the lensing contribution.


Département de Physique Théorique
Université de Genève
24, quai Ernest Ansermet
1211 Genève 4
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