Speaker
Description
Massive neutrinos have a minimal impact on large-scale structure formation but suppress cosmic growth at small, nonlinear scales. We examine small-scale discrepancies between simulations with and without massive neutrinos from the Quijote simulation. Employing a one-to-one halo matching approach based on the initial peaks of haloes, where the initial positions of cold dark matter particles are identical, we compare matched halo pairs. Our results reveal weak correlations among halo initial peak curvature $\hat{s}$, concentration $\hat{c}$, and relative neutrino excess $\epsilon_{\nu}$. We also investigate the dependency of halo bias $\hat{b}$ on $\epsilon_{\nu}$, $\hat{s}$, and $\hat{c}$. While the first two parameters show notable correlations with halo bias, the latter does not. In conclusion, while massive neutrinos do influence halo formation, our findings suggest that constraining neutrino mass solely through observable halo properties is challenging.
