Tachyon Helicity: Does Fermion Change Helicity?

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SUMMARY

The discussion centers on the implications of a left-handed helicity fermion traveling faster than light between two points, A and B. Observers report varying experiences: some see the fermion moving from A to B, others from B to A (indicating backward time travel), and some perceive it as traveling instantaneously. The core question revolves around whether any observer would detect a change to right-handed helicity. The consensus is that since the premise of faster-than-light travel contradicts established physical laws, no definitive answer exists.

PREREQUISITES
  • Understanding of fermion properties and helicity
  • Familiarity with the principles of special relativity
  • Knowledge of causality in physics
  • Basic grasp of quantum mechanics
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  • Research the implications of faster-than-light particles in quantum field theory
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This discussion is beneficial for physicists, students of theoretical physics, and anyone interested in the implications of advanced concepts in quantum mechanics and relativity.

bsaucer
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Suppose a Fermion having left-handed helicity travels faster than light between points A and B. Some observers see it traveling from A to B. Some observers see it traveling from B to A (backwards in time). Some observers see it traveling instantaneously (infinite speed). Do any any of these observers see it having right-handed helicity?
 
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We often get questions like these, which are basically asking, "If something which the laws of physics say is impossible happens, what do the laws of physics say will happen?" Since the premise is impossible, there is no answer.
 

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