Constraining primordial non-Gaussianity using two galaxy surveys and CMB lensing

Abstract

Next-generation galaxy surveys will be able to measure perturbations on scales beyond the equality scale. On these ultra-large scales, primordial non-Gaussianity leaves signatures that can shed light on the mechanism by which perturbations in the early Universe are generated. We perform a forecast analysis for constraining local type non-Gaussianity and its two-parameter extension with a simple scale-dependence. We combine different clustering measurements from future galaxy surveys -- a 21cm intensity mapping survey and two photometric galaxy surveys -- via the multi-tracer approach. Furthermore we then include CMB lensing from a CMB Stage 4 experiment in the multi-tracer, which can improve the constraints on bias parameters. We forecast $\sigma (f_{\mathrm{NL}})\simeq 0.9$ (1.4) by combining SKA1, a Euclid-like (LSST-like) survey, and CMB-S4 lensing. With CMB lensing, the precision on $f_{\mathrm{NL}}$ improves by up to a factor of 2, showing that a joint analysis is important. In the case with running of $f_{\mathrm{NL}}$, our results show that the combination of upcoming cosmological surveys could achieve $\sigma (n_{\mathrm{NL}})\simeq 0.12$ (0.22) on the running index.

arXiv comment7 pages, 2 figures. Version accepted by MNRAS

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