Informal Talk丨Accuracy of bias measurements
Topic: Accuracy of bias measurements from three-point galaxy correlations
Speaker: Kai Hoffmann
Time: 3:30-4:15pm, October 14th (Friday)
Location: 蒙民伟S727
Constraints on cosmological models from the growth of matter density fluctuations can be well improved by growth independent measurements of galaxy bias from third-order galaxy clustering. However, these improvements are limited by the accuracy of such bias measurements. Associating galaxies with dark matter haloes we use the cosmological MICE-GC simulation for validating the halo bias from three-point correlations (3pc) with results from two-point correlations. Our results show that halo bias can be measured accurately with 3pc only when non-local contributions to the bias model are taken into account. Furthermore we show that bias measurements from 3pc in configuration space are consistent with Fourier space results when the analysis is restricted to large scales. Using our measurements we finally validate the universal behaviour between the linear and non-linear bias parameters which we found previously for peak-background split model predictions.