1 INTRODUCTION
2 THEORETICAL TOOLS
2.1 N-body simulations and mock halo catalogues
2.2 Modelling Redshift Distortions
2.3 Modelling Geometric Distortions
3 MEASURING β FROM RSD
3.1 The impact of redshift errors and deprojection
3.2 The impact of geometric distortions
4 DISENTANGLING DYNAMIC AND GEOMETRIC DISTORTIONS
4.1 The method
4.2 Joint constraints on Ωₘ and β
4.3 Constraints on curvature and on the DE equation of state
5 DISCUSSION AND CONCLUSIONS