Observational Cosmology Seminar

The three-dimensional galaxy power spectrum is a powerful probe of local primordial non-Gaussianity (PNG) and linear-order general relativistic (GR) effects on ultra-large scales, accessible to current generation of large-scale structure surveys. In this presentation, I present our calculation of GR effects in the spherical Fourier–Bessel (SFB) power spectrum, which naturally captures wide-angle geometry and radial evolution on the light cone. We quantify the impact and detectability of these relativistic contributions for current galaxy surveys. These horizon-scale GR signatures are important for reaching σ(fNL)~1 and may provide a new avenue to test gravity and dark energy through their imprint on metric perturbations.