If tachyon exists it can send information to the past.
New tachyon research aims to determine if tachyons exist. And another thing is can tachyons exist in our 3D universe? The model of tachyons is that those particles are 4 or even more dimensions. That makes it impossible to see them from the 3D universe. So tachyons can exist only in higher dimensions or in energy levels where particles cannot exchange information with 3D particles.
The only place where tachyon can exist in the form we can see is the black hole. There is a possibility that tachyons exist behind the event horizon. If tachyons exist in the black hole, that hypothetical particle can cause the black hole’s evaporation.
And, if tachyons form in a black hole when ultimate gravity and energy press particles like electrons and photons. And those particles could escape from black holes. The tachyon can also explain dark energy. When this hypothetical particle comes to the third dimension it releases energy. That can explain why nobody has seen that particle yet. The tachyon that falls to the 3rd dimension can turn immediately into photons or some other particles like Higgs bosons.
The problem with tachyon measurements is this. Those particles can:
A) Turn into photons
B) They can form photons if they come out from higher dimensions.
So if tachyon is a particle that exists in higher dimensions its energy level will be so high that it jumps out from the 3D universe. And if tachyon falls to the 3D universe. That means it sends an energy impact around it. In that model, the tachyon forms a photon by sending a shockwave into the space around it. That model means that a photon is the shockwave in the base energy- or base quantum field in the third dimension. The image of a photon can support that model, because the photon has a hole that the ring- or donut-shaped quantum field surrounds. That ring-shaped structure is similar to when somebody throws a stone in the water.
And tachyon can form that kind of energy field, if it falls from the 4th dimension. And releases energy into its environment. If researchers someday can exchange data or wave movement with tachyons that bring unlimited power sources in their hands.
But that requires. That the tachyons can exist. And another thing is that those particles should exist as tachyons in the 3D universe as long as they can release their energy to the receiver. Or they must interact with 3D particles in some other way. The superposition and entanglement with 3D particles bring a lot of energy into our universe. The main problem is that tachyon is the dominating part in that process. The system cannot control tachyons that is in the 4th dimension.
So the system must adjust the receiving particle so that the dominating particle causes resonance in it. And then starts to send data to that particle. The thing is similar to finding channels on the radio without knowing any radio frequency. The system must adjust the spin and energy level of the particle and hope that it finds a frequency that is the same as some tachyon.
The problem with superposition and entanglement with 3D particles is that they must reach so high energy levels that they can force tachyons to oscillate and resonate. Then those particles must start to pump information into them.
There are tests where the particle will be driven as close to the speed of light as possible. Then that particle can be put to spin. There is a hope that the energy that a spinning particle pulls from its environment.
That can pull tachyons into the third dimension. When the energy level of the spinning particle decreases it should pull tachyon to the 3D universe. Theoretical tachyon engine just pulls tachyons from their tachyonic space. And that opens the channel where other tachyons can arrive in the 3D universe. When tachyons come to our universe that particle releases its extra energy. The engine uses that energy to create energy. If, a particle can make a superposition with tachyons that brings energy into the universe. If that thing is possible, that is the biggest revolution in history.
https://www.msn.com/en-us/news/technology/new-tachyon-study-could-unlock-the-secrets-of-time-travel-and-reality/ss-AA1HBksF
https://phys.org/news/2024-07-physicists-tachyons-special-theory.html
https://scitechdaily.com/faster-than-a-speeding-photon-how-tachyons-challenge-modern-physics/
https://thedebrief.org/bizarre-tachyons-that-may-be-able-to-send-data-back-in-time-could-be-reconciled-with-special-relativity/
https://en.wikipedia.org/wiki/Tachyon