Like many others, LIGO made me curious about gravitational waves. I found the paper: Nonlocal Gravity: Damping of Linearized Gravitational Waves http://arxiv.org/abs/1304.1769 I'm having difficulty understanding. Does that mean that damping is implicit in the terms of the tensors? Does it also mean that the energy in the wave just disappears in the non-energy conservation of GR? I'm hoping that there is a non-tensor way to explain what causes the damping and where the energy goes. If not, I'll have to gnash my teeth and accept it. If the decay time is of the order of the age of the universe, then the waves from almost every BH merger since the BB should still be zipping around for LIGO to detect, correct? That would be a large number of events.