3 ms·
It is used in theories that discuss particles with imaginary mass, such as tachyons, that travel backwards in time. Theories that violate causality are consid
by niemandhier 2y ago
It is used in theories that discuss particles with imaginary mass, such as tachyons, that travel backwards in time.
Theories that violate causality are considered unphysical, whereas theories in which measuring such time traveling particle, cannot be distinguished from creating a particle that moves forward in time are not.