Caldeira-Leggett Model, Landau Damping, and the Vlasov-Poisson System

TL;DR

This paper explores the connection between the Caldeira-Leggett model and the Vlasov-Poisson system, demonstrating that damping phenomena in both models are analogous and providing a transformation linking their solutions.

Contribution

It introduces an invertible linear transformation that maps solutions of the Caldeira-Leggett model to those of the linearized Vlasov-Poisson system, highlighting their conceptual similarity.

Findings

Damping in the Caldeira-Leggett model is analogous to Landau damping in plasmas.

A linear transformation connects solutions of the two models.

The analysis clarifies the physical interpretation of dissipation in quantum and plasma systems.

Abstract

The Caldeira-Leggett Hamiltonian (Eq. (1) below) describes the interaction of a discrete harmonic oscillator with a continuous bath of harmonic oscillators. This system is a standard model of dissipation in macroscopic low temperature physics, and has applications to superconductors, quantum computing, and macroscopic quantum tunneling. The similarities between the Caldeira-Leggett model and the linearized Vlasov-Poisson equation are analyzed, and it is shown that the damping in the Caldeira-Leggett model is analogous to that of Landau damping in plasmas [1]. An invertible linear transformation [2, 3] is presented that converts solutions of the Caldeira-Leggett model into solutions of the linearized Vlasov-Poisson system.