Squeezing the halo bispectrum: a test of bias models

Understand

We study the halo-matter cross bispectrum in the presence of primordial non-Gaussianity of the local type.

• We restrict ourselves to the squeezed limit, for which the calculation are straightforward, and perform the measurements in the initial conditions of N-body simulations, to mitigate the contamination induced by nonlinear gravitational evolution.
• Interestingly, the halo-matter cross bispectrum is not trivial even in this simple limit as it is strongly sensitive to the scale-dependence of the quadratic and third-order halo bias.
• Therefore, it can be used to test biasing prescriptions.