The double copy: from optics to quantum gravity

TL;DR

The paper reviews the double copy relationship linking electromagnetism and gravity, highlighting its theoretical significance and practical applications in optical systems and gravitational calculations, encouraging interdisciplinary research.

Contribution

It provides a comprehensive review of the double copy concept and advocates for its exploration in optics and condensed matter physics.

Findings

Double copy relates electromagnetism and gravity.

Practical applications include gravitational observables calculation.

Optical systems can simulate gravitational phenomena.

Abstract

Recently, an intriguing relationship (the "double copy") has been discovered between theories like electromagnetism, and gravity. This potentially gives us a new way to think about gravity, and there are also practical applications involving the efficient calculation of gravitational observables, and also how to simulate gravity using optical systems. In this tutorial, we will review what is known about the double copy, and argue that now is the perfect time for researchers in optics and / or condensed matter to become interested in this fascinating correspondence.