Vacuum and repulsive gravity
Posted by Newman, at physics.stackexchange.com,
How can one show from General Relativity that gravity is attractive force, and under which conditions it becomes repulsive…
How can one show from General Relativity that gravity is attractive force, and under which conditions it becomes repulsive…
Confinement of antihydrogen might help provide a future answer. http://arxiv.org/abs/1104.4982