c_abf2D. SprayberryK. FanningN. Palanque-DelabrouilleH. SeoH. ZouB.A. WeaverL. Le GuillouE. ChaussidonW.J. PercivalF. PradaD. BrooksT. KisnerG. NizE. SanchezE. GaztañagaM. SchubnellM. ManeraG. RossiA. de MattiaG. TarléT. ClaybaughD. SchlegelA. LambertS. ColeS. AhlenA. MeisnerC. YècheA. de la MacorraM. Vargas-MagañaJ. AguilarS.Gontcho A. GontchoR. MiquelP. DoelC. HowlettA.J. Ross2025-12-312025-12-312025-01-011475-751610.48550/arxiv.2406.00191https://ror.circle-u.eu/handle/123456789/1715306Abstract The next generation of spectroscopic surveys is expected to achieve an unprecedented level of accuracy in the measurement of cosmological parameters. To avoid confirmation bias and thereby improve the reliability of these results, blinding procedures become a standard practice in the cosmological analyses of such surveys. Blinding is especially crucial when the impact of observational systematics is important relative to the cosmological signal, and a detection of that signal would have significant implications. This is the case for local primordial non-gaussianity, as probed by the scale-dependent bias of the galaxy power spectrum at large scales that are heavily sensitive to the dependence of the target selection on the imaging quality, known as imaging systematics. We propose a blinding method for the scale-dependent bias signature of local primordial non-gaussianity at the density field level which consists in generating a set of weights for the data that replicate the scale-dependent bias. The applied blinding is predictable, and can be straightforwardly combined with other catalog-level blinding procedures that have been designed for the baryon acoustic oscillation and redshift space distortion signals. The procedure is validated through simulations that replicate data from the first year of observation of the Dark Energy Spectroscopic Instrument, but may find applications to other upcoming spectroscopic surveys.OPEN[PHYS.ASTR] Physics [physics]/Astrophysics [astro-ph][PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]galaxy surveys5107 Particle and high energy physics (for-2020)Galaxy clusteringNuclear0202 AtomicPower spectrumpower spectrumcosmological parameters from LSS0201 Astronomical and Space Sciences (for)FOS: Physical sciencesNuclear & Particles Physics (science-metrix)Particle and Plasma Physics (for)Molecular5005106 Nuclear and Plasma Physics (for-2020)51 Physical Sciences (for-2020)Cosmology and Nongalactic Astrophysics (astro-ph.CO)Galaxy surveysCosmological parameters from LSS5101 Astronomical sciences (for-2020)530Astrophysics - Cosmology and Nongalactic Astrophysicsgalaxy clusteringpublication2406.0019110261/385068