Neutrino
- Near-massless particles produced as side effect of particle decay, collision
- No interactions with electromagnetic force, resulting in general lack of interaction with normal matter
- Somehow capable of being detected by handheld scanning devices by 24th century despite this
- Only reference in Enterprise was shipboard, no reference in TOS
- Some sort of locally-generated W/Z boson field?
- Somehow capable of being detected by handheld scanning devices by 24th century despite this
- Due to non-interactive properties, occasionally used as means of communication in areas of otherwise-heavy interference (TNG: "The Enemy", "Sins of the Father")
- Difficulty in generation and detection render this effective only in particular scenarios
- Common side-effect of subspace phenomena (TNG: "Clues"; DS9: "Emissary"; VOY: "Prime Factors", "Child's Play", "Shattered")
- Likely as a result of particle decay from tetryons and other particles stable in subspace, unstable in normal space
- Produced as radiation by some warp reactors, from both M/AM annihilation and subspace field production (ENT: ""Civilization"; TNG: "The Outcast"; DS9: "Sacrifice of Angels"; Star Trek: Insurrection)
- Such drives can potentially be identified from such neutrino emissions (DS9: "For the Uniform"; VOY: "Dreadnought")
- General properties