Primordial non-Gaussianities (PNG) leave unique signatures in the bispectrum of the large-scale structure. With upcoming galaxy surveys set to improve PNG constraints by at least one order of magnitude, it is important to account for any potential contamination. In our work we show how to include wide-angle effects into the 3-dimensional observed galaxy bispectrum. We compute the leading wide-angle corrections to the monopole, finding that they could mimic local PNG with an amplitude of f NL = O(0.1). We also compute the dipole induced by wide-angle effects, whose amplitude is a few-percent of the flat-sky monopole. We estimate that wide-angle effects in the monopole can be safely neglected for survey volumes of the order of 8 Gpc3 h -3, while the dipole can start being detected from surveys probing volumes larger than 50 Gpc3 h -3. Our formalism can be readily adapted to realistic survey geometries and to include relativistic effects, which may become relevant at high redshifts.

Wide-angle effects in the galaxy bispectrum / K. Pardede, E. Di Dio, E. Castorina. - In: JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS. - ISSN 1475-7516. - 2023:9(2023 Sep 14), pp. 30.1-30.27. [10.1088/1475-7516/2023/09/030]

Wide-angle effects in the galaxy bispectrum

E. Castorina
Ultimo
2023

Abstract

Primordial non-Gaussianities (PNG) leave unique signatures in the bispectrum of the large-scale structure. With upcoming galaxy surveys set to improve PNG constraints by at least one order of magnitude, it is important to account for any potential contamination. In our work we show how to include wide-angle effects into the 3-dimensional observed galaxy bispectrum. We compute the leading wide-angle corrections to the monopole, finding that they could mimic local PNG with an amplitude of f NL = O(0.1). We also compute the dipole induced by wide-angle effects, whose amplitude is a few-percent of the flat-sky monopole. We estimate that wide-angle effects in the monopole can be safely neglected for survey volumes of the order of 8 Gpc3 h -3, while the dipole can start being detected from surveys probing volumes larger than 50 Gpc3 h -3. Our formalism can be readily adapted to realistic survey geometries and to include relativistic effects, which may become relevant at high redshifts.
cosmological parameters from LSS; dark energy experiments; galaxy clustering; redshift surveys;
Settore FIS/05 - Astronomia e Astrofisica
14-set-2023
Article (author)
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/1025886
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