The Quantum Spectral Method: From Atomic Orbitals to Classical Self-Force

TL;DR

The paper introduces the Quantum Spectral Method, a novel analytical approach that derives classical dynamics from quantum matrix elements, enabling non-perturbative calculations of self-force in periodic systems.

Contribution

It presents the Quantum Spectral Method, applying Bohr's correspondence principle to connect quantum and classical dynamics for the first time in this context.

Findings

Calculated electromagnetic inspiral at all multipole orders.

Demonstrated non-perturbative classical limit from quantum matrix elements.

Proposed future extension to gravitational self-force in Schwarzschild spacetime.

Abstract

Can classical systems be described analytically at all orders in their interaction strength? For periodic and approximately periodic systems, the answer is yes, as we show in this work. Our analytical approach, which we call the \textit{Quantum Spectral Method}, is based on a novel application of Bohr's correspondence principle, obtaining non-perturbative classical dynamics as the classical limit of \textit{quantum matrix elements}. A major application of our method is the calculation of self-force as the classical limit of atomic radiative transitions. We demonstrate this by calculating an adiabatic electromagnetic inspiral, along with its associated radiation, at all orders in the multipole expansion. Finally, we propose a future application of the Quantum Spectral Method to compute scalar and gravitational self-force in Schwarzschild, analytically.