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Learning · Advanced physics
Tachyons
Hypothetical faster-than-light particles — what the maths says, why they're weird, and what physics actually allows.
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Summary
Tachyons are hypothetical particles that would always travel faster than light — never observed in experiments.
They create causality headaches (effect before cause in some frames). In theory, 'tachyonic fields' often mean instability, not Star Trek warp drive.
- Real physics: nothing with mass reaches light speed from rest.
- OPERA neutrino scare was an equipment error — not FTL.
- Quantum entanglement ≠ sending messages faster than light.
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