Joint analysis of anisotropic power spectrum, bispectrum and trispectrum: application to N-body simulations

Abstract

We perform for the first time a joint analysis of the monopole and quadrupoles for power spectrum, bispectrum and integrated trispectrum (i-trispectrum) from the redshift space matter field in N-body simulations. With a full Markov Chain Monte Carlo exploration of the posterior distribution, we quantify the constraints on cosmological parameters for an object density of $n_{\mathrm{p}}=5\times 10^{-4}(h{\mathrm{Mpc}}^{-1}{)}^3$, redshift $z=0.5$, and a covariance corresponding to a survey volume of $V_{\mathrm{survey}}=25(h^{-1}\mathrm{Gpc}{)}^3$, a set up which is representative of forthcoming galaxy redshift surveys. We demonstrate the complementarity of the bispectrum and i-trispectrum in constraining key cosmological parameters. In particular, compared to the state-of-the-art power spectrum (monopole plus quadrupole) and bispectrum (monopole) analyses, we find 1D $68\%$ credible regions smaller by a factor of $(72\%,78\%,72\%,47\%,46\%)$ for the parameters $(f,{\sigma }_8,f_{\mathrm{nl}},{\alpha }_{\parallel },{\alpha }_{\perp })$ respectively. This work motivates the additional effort necessary to include the redshift-space anisotropic signal of higher-order statistics in the analysis and interpretation of ongoing and future galaxy surveys.

arXiv comment42 pages (21 + appendixes and references), 12 figures, 3 tables, matching accepted version after minor revision

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