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arXiv · 2401.13036

Analysis of BOSS Galaxy Data with Weighted Skew-Spectra

Shu-Fan Chen·Priyesh Chakraborty·Cora Dvorkin
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Abstract

We present the first application of the weighted skew-spectra to analyze non-Gaussian information in galaxy survey data. Using the tree-level galaxy skew-spectra together with the one-loop power spectrum multipoles, we analyze the Sloan Digital Sky Survey (SDSS)-III Baryon Oscillation Spectroscopic Survey (BOSS) galaxy clustering data, and target our search towards the equilateral bispectrum shape of primordial non-Gaussianity. We use the Effective Field Theory model for the galaxy power spectrum and bispectrum, and account for systematic effects, such as the survey geometry. From our likelihood analysis, we find $f_{\rm NL}^{\rm equil}=-34^{+296}_{-334}$ at $68\%$ CL, consistent with previous works, while systematic errors from our treatment of the survey geometry lead to an unreliable estimation of $f_{\rm NL}^{\rm ortho}$. We further constrain the bias and counterterm parameters, while keeping the cosmology fixed to $\textit{Planck }2018$ values. As a check, we also validate our analysis pipeline using the ${\tt Nseries}$ simulation suite.

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Shu-Fan Chen, Priyesh Chakraborty, Cora Dvorkin. 2024-01-23. Analysis of BOSS Galaxy Data with Weighted Skew-Spectra. https://arxiv.org/abs/2401.13036

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