Analysis of BOSS galaxy data with weighted skew-spectra
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...
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Veröffentlicht in: | Journal of cosmology and astroparticle physics 2024-05, Vol.2024 (5), p.11 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | 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
NL
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
NL
ortho
.
We further constrain the bias and counterterm parameters, while keeping the cosmology
fixed to
Planck
2018 values. As a check, we also validate our analysis pipeline using the
Nseries
simulation suite. |
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ISSN: | 1475-7516 1475-7516 |
DOI: | 10.1088/1475-7516/2024/05/011 |