Contributions from primordial non-Gaussianity and General Relativity to the galaxy power spectrum

Understand

We compute the real space galaxy power spectrum, including the leading order effects of General Relativity and primordial non-Gaussianity from the $f_{\mathrm{NL}}$ and $g_{\mathrm{NL}}$ parameters.

• Such contributions come from the one-loop matter power spectrum terms dominant at large scales, and from the factors of the non-linear bias parameter $b_{\mathrm{NL}}$ (akin to the Newtonian $b_{\phi}$).
• We assess the detectability of these contributions in Stage-IV surveys.
• In particular, we note that specific values of the bias parameter may erase the primordial and relativistic contributions to the configuration space power spectrum.