Speaker
Description
New surveys of the large-scale structure will offer the chance to probe up to the Hubble scale to with percentage level precision. Therefore, in order to accurately infer information from these scales, we must consider percentage level corrections to our theoretical corrections that affect our observables. These include contributions from Doppler-type relativistic projection effects as well as wide separation effects, which are induced as we correlate points separated by large distances. In this talk we investigate these contributions to the bispectrum in some detail, including both wide angle effects and, for the first time, radial redshift effects. We show how they are intrinsically dependent on the choice of line of sight, and how we can make better choices of LOS to mitigate these effects. We investigate how they mix with the relativistic corrections and are of the same order, appearing similarly in the odd and even multipoles and can add additional relativistic signal through their mixing which is typically ignored. Further, if unaccounted for, we show they can mimic local type $f_{NL} \sim \mathcal{O}(10)$ in the worst cases.
