Enea Di Dio - May 12, 2017 Relativistic effects on LSS observables I will discuss the Large Scale Structure power spectrum and bispectrum in a relativistic framework. To first order, a relativistic description includes terms beyond the Kaiser approximation (doppler effects and galaxy evolution), gravitational potentials and integrated terms (cosmic magnification, integrated Sachs-Wolfe and Shapiro time-delay). I will show how they can be isolated by correlating different probes, or by using the so-called multi-tracer technique. To second order, the relativistic galaxy number counts contain several new terms. I will show their impact on the bispectrum and how they may affect a future measurement of primordial non-gaussianity.