Showing 1–2 of 2 results for author: Besharat, A

Fixing EFT equations with a reservoir model

Authors: A. Besharat, L. Lehner, J. Radkovski

Abstract: Effective Field Theories with higher derivatives often yield equations of motion which define ill-posed problems. We present a method for enhancing control on such theories by coupling them to a field living in one extra dimension. The resulting action principle helps to define a well-posed problem introducing a mechanism to control UV behavior. Physically this is achieved by dissipating the energ… ▽ More Effective Field Theories with higher derivatives often yield equations of motion which define ill-posed problems. We present a method for enhancing control on such theories by coupling them to a field living in one extra dimension. The resulting action principle helps to define a well-posed problem introducing a mechanism to control UV behavior. Physically this is achieved by dissipating the energy in the short-wavelength modes into the extra dimension. We examine the resulting dynamics and compare it to alternative proposals for studying such theories in the non-linear regime. △ Less

Submitted 13 February, 2026; originally announced February 2026.

Comments: 20 pages, 2 figures

Optical Aharonov-Bohm effect due to toroidal moment inspired by general relativity

Authors: A. Besharat, M. Miri, M. Nouri-Zonoz

Abstract: We study the analogy between propagation of light rays in a stationary curved spacetime and in a toroidal (meta-)material. After introducing a novel gravitational analog of the index of refraction of a magneto-electric medium, it is argued that light rays not only feel a Lorentz-like force in a magneto-electric medium due to the non-vanishing curl of the toroidal moment, but also there exists an o… ▽ More We study the analogy between propagation of light rays in a stationary curved spacetime and in a toroidal (meta-)material. After introducing a novel gravitational analog of the index of refraction of a magneto-electric medium, it is argued that light rays not only feel a Lorentz-like force in a magneto-electric medium due to the non-vanishing curl of the toroidal moment, but also there exists an optical analog of Aharonov-Bohm effect for the rays traveling in a region with a curl-free toroidal moment. Experimental realization of this effect could utilize either a multiferroic material or a toroidal metamaterial. △ Less

Submitted 6 May, 2020; v1 submitted 30 March, 2019; originally announced April 2019.

Comments: 18 pages, Replaced with the published version

Journal ref: J. Phys. Commun. 3 (2019) 115019