The followings are merely wild ideas and speculations, so don’t take it too seriously
What if there exists a particle which is quite similar like photon but it travels backward in time with constant speed? Let’s call it backton.
Now, something must happen when a backton meets a conventional particle.
In the level of elementary particles the quantum mechanics rules the world.
What if the backtons are responsible for collapsing the wave function?
If one accepts the many-world interpretation of quantum theory, then maybe backton plays role in splitting the world-lines.
The observer plays key role in the quantum theory.
What if consciousness itself is somehow related to backtons?
What if the light-speed limit in relativity theory is also related somehow to the backton-flow present everywhere?
What if the backton-theory is the missing link between quantum mechanics and relativity?
