This would be really difficult. The primary problem is that neutrinos don’t interact with most things, so to send a signal you’d need to send a massive burst of neutrinos to the point where we should expect it to show up on other neutrino detectors also. The only plausible way this might work is if someone used a system at CERN, maybe the OPERA system itself in a highly improved and calibrated form to send the neutrinos back.
Although if neutrinos can go back in time then so much of physics may be wrong that this sort of speculation is likely to be extremely unlikely to be at all helpful. This is almost like going to an 17th century physicist and asking them to speculate what things would be like if nothing could travel faster than the speed of light.
This would be really difficult. The primary problem is that neutrinos don’t interact with most things, so to send a signal you’d need to send a massive burst of neutrinos to the point where we should expect it to show up on other neutrino detectors also. The only plausible way this might work is if someone used a system at CERN, maybe the OPERA system itself in a highly improved and calibrated form to send the neutrinos back.
Although if neutrinos can go back in time then so much of physics may be wrong that this sort of speculation is likely to be extremely unlikely to be at all helpful. This is almost like going to an 17th century physicist and asking them to speculate what things would be like if nothing could travel faster than the speed of light.