DOE OSTI · 3007324
Blinding scheme for the scale-dependence bias signature of local primordial non-Gaussianity for DESI 2024
Abstract
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.
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Chaussidon, E. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Université Paris-Saclay, Gif-sur-Yvette (France)] (ORCID:0000000189964874), de Mattia, A. [Université Paris-Saclay, Gif-sur-Yvette (France)] (ORCID:0000000309202947), Yèche, C. [Université Paris-Saclay, Gif-sur-Yvette (France)] (ORCID:0000000151468533), Aguilar, J. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)], Ahlen, S. [Boston University, MA (United States)] (ORCID:0000000160987247), Brooks, D. [University College London (United Kingdom)], Claybaugh, T. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)], Cole, S. [Durham University (United Kingdom)] (ORCID:0000000259547903), de la Macorra, A. [Universidad Nacional Autónoma de México (Mexico)] (ORCID:0000000217691640), Doel, P. [University College London (United Kingdom)], Fanning, K. [Stanford University, Menlo Park, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)] (ORCID:0000000323713356), Gaztañaga, E. [Institut d'Estudis Espacials de Catalunya (IEEC), Barcelona (Spain); University of Portsmouth (United Kingdom); Institute of Space Sciences, Barcelona (Spain)], Gontcho, S. Gontcho A. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)] (ORCID:000000033142233X), Howlett, C. [University of Queensland (Australia)] (ORCID:0000000210819410), Kisner, T. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)] (ORCID:0000000335107134), Lambert, A. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)], Le Guillou, L. [Sorbonne Université, Paris (France)] (ORCID:0000000171788868), Manera, M. [Universitat Autònoma de Barcelona, Bellaterra (Barcelona) (Spain); The Barcelona Institute of Science and Technology, Bellaterra (Barcelona) (Spain)] (ORCID:0000000349628934), Meisner, A. [NSF NOIRLab, Tucson, AZ (United States)] (ORCID:0000000211257384), Miquel, R. [Institució Catalana de Recerca i Estudis Avançats, Barcelona (Spain); The Barcelona Institute of Science and Technology, Bellaterra Barcelona (Spain)], Niz, G. [Universidad de Guanajuato – DCI, Guanajuato (Mexico); Instituto Avanzado de Cosmología A. C. (Mexico)] (ORCID:0000000215448946), Palanque-Delabrouille, N. [Université Paris-Saclay, Gif-sur-Yvette (France); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)] (ORCID:000000033188784X), Percival, W. J. [University of Waterloo, ON (Canada); Perimeter Institute for Theoretical Physics, Waterloo, ON (Canada)] (ORCID:0000000206445727), Prada, F. [Instituto de Astrofísica de Andalucía (CSIC), Granada (Spain)] (ORCID:0000000171458674), Ross, A. J. [The Ohio State University, Columbus, OH (United States)] (ORCID:0000000275229083), Rossi, G. [Sejong University, Seoul (Korea)], Sanchez, E. [CIEMAT, Madrid (Spain)] (ORCID:0000000296468198), Schlegel, D. [Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)], Schubnell, M. [University of Michigan, Ann Arbor, MI (United States)], Seo, H. [Ohio University, Athens, OH (United States)] (ORCID:0000000265883508), Sprayberry, D. [NSF NOIRLab, Tucson, AZ (United States)], Tarlé, G. [University of Michigan, Ann Arbor, MI (United States)] (ORCID:0000000317040781), Vargas-Magaña, M. [Universidad Nacional Autónoma de México (Mexico)] (ORCID:0000000338411836), Weaver, B. A. [NSF NOIRLab, Tucson, AZ (United States)], Zou, H. [Chinese Academy of Sciences, Beijing (China)] (ORCID:0000000266843997). 2025-01-30. Blinding scheme for the scale-dependence bias signature of local primordial non-Gaussianity for DESI 2024. https://doi.org/10.1088/1475-7516%2F2025%2F01%2F135
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