This is a physics question. But the current laws of physics do not allow for going backwards in time, certainly no way for anything to interact with a past version of itself, so even if, IF it was possible under some future model that will replace the current one, there's no way to predict what would happen with the current model because the current model says it doesn't happen. It's like asking pre-Copernicus physics to calculate the movement of different star systems around a galaxy.