Light particles - A window to fundamental physics

Abstract

In these proceedings we illustrate that light, very weakly interacting particles can arise naturally from physics which is fundamentally connected to very high energy scales. Searching for them therefore may give us interesting new insights into the structure of fundamental physics. Prime examples are the axion, and more general axion-like particles, as well as hidden sector photons and matter charged under them.

Comments: 8 pages, 1 figure, contributed to the proceedings of Axions 2010, January 15-17, 2010, Gainesville, Florida