Redshift-weighted constraints on primordial non-Gaussianity from the clustering of the eBOSS DR14 quasars in Fourier space

Emanuele Castorina, Nick Hand, Uroš Seljak, Florian Beutler, Chia Hsun Chuang, Cheng Zhao, Héctor Gil-Marín, Will J. Percival, Ashley J. Ross, Peter Doohyun Choi, Kyle Dawson, Axel De La Macorra, Graziano Rossi, Rossana Ruggeri, Donald Schneider, Gong Bo Zhao

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Abstract

We present constraints on local primordial non-Gaussianity (PNG), parametrized through floc NL, using the Sloan Digital Sky Survey IV extended Baryon Oscillation Spectroscopic Survey Data Release 14 quasar sample. We measure and analyze the anisotropic clustering of the quasars in Fourier space, testing for the scale-dependent bias introduced by primordial non-Gaussianity on large scales. We derive and employ a power spectrum estimator using optimal weights that account for the redshift evolution of the PNG signal. We find constraints of ..51 < floc NL < 21 at 95% conffidence level. These are among the tightest constraints from Large Scale Structure (LSS) data. Our redshift weighting improves the error bar by 15% in comparison to the unweighted case. If quasars have lower response to PNG, the constraint degrades to ..81 < floc NL < 26, with a 40% improvement over the standard approach. We forecast that the full eBOSS dataset could reach σfloc NL ≃5-8 using optimal methods and full range of scales.

Original languageEnglish (US)
Article number010
JournalJournal of Cosmology and Astroparticle Physics
Volume2019
DOIs
StatePublished - Jan 1 2019

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics

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