# Biases from neutrino bias: to worry or not to worry?

## TL;DR

This paper examines how neglecting the scale-dependent halo bias caused by massive neutrinos can lead to systematic errors in cosmological parameter estimation, emphasizing the importance of accounting for this effect in future surveys.

## Contribution

It demonstrates the significance of neutrino-induced scale-dependent bias on cosmological analyses and provides a simple method to mitigate this systematic effect.

## Key findings

- Neglecting neutrino bias can cause non-negligible errors in future surveys.
- A simple correction recipe can effectively account for neutrino bias effects.
- Current surveys are less affected by this bias.

## Abstract

The relation between the halo field and the matter fluctuations (halo bias), in the presence of massive neutrinos depends on the total neutrino mass, massive neutrinos introduce an additional scale-dependence of the bias which is usually neglected in cosmological analyses. We investigate the magnitude of the systematic effect on interesting cosmological parameters induced by neglecting this scale dependence, finding that while it is not a problem for current surveys, it is non-negligible for future, denser or deeper ones depending on the neutrino mass, the maximum scale used for the analyses and the details of the nuisance parameters considered. However there is a simple recipe to account for the bulk of the effect as to make it fully negligible, which we illustrate and advocate should be included in analysis of forthcoming large-scale structure surveys.