Misure indipendenti dal modello di redshift-space distortions e magnificazione da spettri di potenza nello spazio armonico

The project focusses on the harmonic-space analysis of the clustering of galaxy number counts, implementing a model-independent framework to measure the main contribution to the signal beyond Newtonian density fluctuations, namely redshift-space distortions and weak-lensing magnification. By decomposing galaxy number density fluctuations into its three main components, we study how its harmonic-space power spectrum is able to retain information on each of the contributions separately. To this aim, we exploit redshift tomography, i.e. we slice the observed source redshift distribution into concentrical redshift shells and analyse auto and cross-bin correlations. Finally, we shall apply the formalism to synthetic datasets and provide constraints on the linear galaxy bias, the growth rate of matter fluctuations, and the magnification bias of the observed galaxy sample.