Worldline approach for numerical computation of electromagnetic Casimir energies: Scalar field coupled to magnetodielectric media

Abstract

We present a worldline method for the calculation of Casimir energies for scalar fields coupled to magnetodielectric media. The scalar model we consider may be applied in arbitrary geometries, and it corresponds exactly to one polarization of the electromagnetic field in planar layered media. Starting from the field theory for electromagnetism, we work with the two decoupled polarizations in planar media and develop worldline path integrals, which represent the two polarizations separately, for computing both Casimir and Casimir-Polder potentials. We then show analytically that the path integrals for the transverse-electric (TE) polarization coupled to a dielectric medium converge to the proper solutions in certain special cases, including the Casimir-Polder potential of an atom near a planar interface, and the Casimir energy due to two planar interfaces. We also evaluate the path integrals numerically via Monte-Carlo path-averaging for these cases, studying the convergence and performance of the resulting computational techniques. While these scalar methods are only exact in particular geometries, they may serve as an approximation for Casimir energies for the vector electromagnetic field in other geometries.

Worldline formalism for a confined scalar field

“…In particular, worldline numerics is currently one of the few available methods to benchmark experimental measurements on the Casimir effect (first considered in [31], see e.g. its applications to other geometries in [32,33], and to more realistic media in [34]). In this context, worldline based numerical analysis has been used to determine the range of validity of the scheme known as proximity force approximation [35,36].…”

Probability Bifurcations of Lévy Bridges

“…The properties and statistics of Brownian bridges have been thoroughly studied [21]. They are important in diverse areas, occurring in financial mathematics (such as in modeling bond prices [22] and accelerating convergence of Monte Carlo simulations [23]), models of animal movements [24], and Monte Carlo path-integral methods in quantum mechanics [25,26].…”