Speaker
Description
In the next few years, the upcoming large-scale structure surveys such as DESI, Euclid, and particularly SPHEREx, are expected to significantly enhance sensitivity in detecting the signature of primordial local non-Gaussianities (PNG), through the scale-dependent bias on the large scale limit of the galaxy power spectrum.
However, on such large scales, this PNG could be confused with general relativistic (GR) effects arising from the full relativistic expressions of the galaxy number counts (GNC).
For this reason, we developed an open-source code, GaPSE.jl [1], that computes efficiently and accurately the observed power spectrum including GR and wide-angle effects, with any realistic survey geometry for single and multi tracers. In this talk, I will present the main features of GaPSE and its basic uses.
[1] Foglieni, Pantiri, Di Dio, Castorina, Large Scale Limit of the Observed Galaxy Power Spectrum (2023), Phys. Rev. Lett. 131, 111201, DOI: 10.1103/PhysRevLett.131.111201
