Constraint of Void Bias on Primordial non-Gaussianity

Understand

We study the large-scale bias parameter of cosmic voids with primordial non-Gaussian (PNG) initial conditions of the local type.

• In this scenario, the dark matter halo bias exhibits a characteristic scale dependence on large scales, which has been recognized as one of the most promising probes of the local PNG.
• Using a suite of $N$-body simulations with Gaussian and non-Gaussian initial conditions, we find that the void bias features scale-dependent corrections on large scales, similar to its halo counterpart.
• We find excellent agreement between the numerical measurement of the PNG void bias and the general peak-background split prediction.