# Chiral Vortical Effect for Bosons

## TL;DR

This paper introduces a new chiral vortical effect for bosons, demonstrating a spin current induced by medium rotation, which extends the concept of anomaly-related effects from fermions to vector bosons.

## Contribution

The authors derive a novel anomalous effect for bosons using the Kubo formula, expanding the understanding of chiral vortical effects beyond fermionic systems.

## Key findings

- Identified a spin current of vector bosons along rotation axis
- Proposed a mechanism for helicity transfer from flow to magnetic helicity
- Extended anomaly-related effects to bosonic fields

## Abstract

The thermal contribution to the chiral vortical effect is believed to be related to the axial anomaly in external gravitational fields. We use the universality of the spin-gravity interaction to extend this idea to a wider set of phenomena. We consider the Kubo formula at weak coupling for the spin current of a vector field and derive a novel anomalous effect caused by the medium rotation: the chiral vortical effect for bosons. The effect consists in a spin current of vector bosons along the angular velocity of the medium. We argue that it has the same anomalous nature as in the fermionic case and show that this effect provides a mechanism for helicity transfer, from flow helicity to magnetic helicity.