There have been tests for other dimensions. Usually they look for energy leaking into other directions. Here's a recent one that tested gravity: https://arstech

There have been tests for other dimensions. Usually they look for energy leaking into other directions. Here's a recent one that tested gravity: https://arstechnica.com/science/2020/04/gravitys-inverse-square-law-tested-at-scale-of-a-human-hair-and-passes/ https://arstechnica.com/science/2020/04/gravitys-inverse-squ...