Constraints on a k-dependent bias from galaxy clustering

7th Young Researcher Meeting

Menegoni, E.^1

CNRS, Laboratoire Univers et Theories (LUTh), UMR 8102 CNRS, Observatoire de Paris, Université Paris Diderot, 5 Place Jules Janssen, Meudon

92190, France^1

关键词: Bias modeling;    Cosmological parameters;    Density fluctuation;    Galaxy bias;    Galaxy clustering;    Growth indexes;    Matrix analysis;    Parametrizations;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/841/1/012007/pdf
DOI  :  10.1088/1742-6596/841/1/012007

来源: IOP

【 摘 要 】

We forecast the future constraints on scale-dependent parametrizations of galaxy bias and their impact on the estimate of cosmological parameters from the power spectrum of galaxies: in our approach we perform a Fisher matrix analysis with two different parametrizations of scale-dependent bias. The two main results obtained from the analysis are: first, allowing for a scale-dependent bias does not significantly increase the errors on the other cosmological parameters apart from the rms amplitude of density fluctuations, σ8, and the growth index γ, whose uncertainties increase by a factor up to two, depending on the bias model adopted. Second, we find that the accuracy in the linear bias parameter b0 can be estimated to within 1-2% at various redshifts regardless of the fiducial model. The non-linear bias parameters have significantly large errors that depend on the model adopted.