Dynamics of classical and quantum spin in external fields: A general formalism

TL;DR

This paper develops a general formalism to analyze the dynamics of classical and quantum spins in external fields, with applications across neutrino physics, astrophysics, and high-energy physics.

Contribution

It introduces a unified approach using the projection technique to study spin dynamics in various physical contexts, bridging classical and quantum descriptions.

Findings

Unified formalism for classical and quantum spin dynamics

Applications to neutrino physics and astrophysics

Framework adaptable to high-energy and heavy-ion physics

Abstract

We study the dynamics of classical and quantum particles with spin and dipole moments in external fields within the framework of the general approach by making use of the projection technique. Applications include the neutrino physics in matter, polarization phenomena in astrophysics, high-energy and heavy-ion physics.