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Can someone more knowledgeable explain this better please? I have questions: - if you can measure the 'optical singularities' travelling FTL, then surely 'info

• gus_massa 6mo ago
  Good questions: > if you can measure the 'optical singularities' travelling FTL, then surely 'information' is travelling FTL? Information is not traveling FTL. The canonical example is when you have a lighthouse in the middle of a huge circular wall. The light spot may move faster than light when you see it on the wall, but the info moves from the center to the wall, not along the wall. When the singularities are far away, you can treat them like a single entity, and track the anti-peak and measure it's speed and they will move like 1/100 of the speed of light in this case. When the singularities are very close together the anti-peak may move at a faster speed (FTL IIUC), but it's just an illusion for tracking the peak. The information moves slower than light. > does it matter (i.e. violate relativity) if something is travelling faster than light speed in some medium as long as it doesn't travel faster than light in vacuum? This is totally possible. It's common if you live inside the water pool of a nuclear reactor or a neutrino detector. More info in https://en.wikipedia.org/wiki/Cherenkov_radiation https://en.wikipedia.org/wiki/Cherenkov_radiation