Wide-angle effects in the galaxy bispectrum

Understand

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 $f_{\rm NL} = \mathcal{O}\left( 0.1 \right)$.