I don't believe any messages to the past will succeed or have any impact on us now, primarily because it depends on a predetermined future and between entropy and chaos theory I don't believe there is a predetermined future. Of course that's my opinion and I don't have the scientific backing in theoretical physics to make any substantial claims to this effect, so it could be possible the future is predetermined or that there are infinite futures endlessly branching off from one another or anything in between. Of course I'm biased too, I would very much like to have control over my future.
Any messages of substance immediately contradict their purpose in sending anyway. Say you sent a message with all the outcomes of the research from the LHC experiments back to yourself before you began (most people should know where this is going), because this now means you no longer run the experiments, the results are never formulated and you never send them to yourself. So nothing would happen.
Any messages of substance immediately contradict their purpose in sending anyway. Say you sent a message with all the outcomes of the research from the LHC experiments back to yourself before you began (most people should know where this is going), because this now means you no longer run the experiments, the results are never formulated and you never send them to yourself. So nothing would happen.