Description
Bispectrum and finite-volume effects
Higher-order statistics, such as the galaxy bispectrum, provide complementary information to the power spectrum and are particularly sensitive to primordial non-Gaussianity (PnG). As upcoming galaxy surveys are expected to tighten constraints on PnG by an order of magnitude or more, it becomes crucial to account for sources of systematic contamination, especially those arising from finite-volume effects.
In this talk, I will focus on the impact of survey geometry and wide-angle effects on the bispectrum multipoles. I will discuss recent progress in incorporating window function effects into bispectrum analyses, highlighting potential subtleties and challenges. In particular, I will show that wide-angle corrections can mimic a local PnG signal with an effective fNL∼0.1 in the bispectrum monopole and can induce a dipole component reaching a few percent of the flat-sky monopole amplitude. I will conclude by outlining future directions and possible applications of these works.
