Anne-Christine Davis (DAMTP, University of Cambridge)
There has been a lot of interest in theories that modified Einstein gravity but which reduce to general relativity in certain limits. Such modified gravity theories predict the existence of a fifth force. There are severe constraints on fifth forces from solar system observations. However there has been a recent resurgence of interest in modified gravity theories with the advent of sophisticated screening mechanism whereby the fifth force is suppressed in the solar system but not necessarily beyond. I will review some models of modified gravity and display the screening mechanism. I will then discuss how such models can be tested and constrained using laboratory experiments.