How can we say a particle is travelling faster than the speed of light if we can't measure it?

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Offline thedoc

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Uttam Pandey asked the Naked Scientists:
   Let's suppose any partical is traveling with speed more than light.
But the problem is, we can not say that it is travelling with a higher speed than light.
Because we have no instrument which can measure speed more than light i.e. our aal instument work on maximum quantum level or we can say it's based on excitation of electrons and emitting photons whose speed is slightly less than that of light.
What do you think?
« Last Edit: 09/05/2016 18:50:01 by _system »

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Offline evan_au

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There is a speculative particle called the "Tachyon" which could only travel faster than light.
As you say, we might have extreme difficulty detecting it.

There is no experimental evidence for its existence at this time, and there are some good theoretical reasons why it could not exist.

See: https://en.wikipedia.org/wiki/Tachyon

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Offline jeffreyH

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If there were such a thing as negative energy with the property of repulsion that could push matter apart and evetually expand it at speeds faster than light then you could possibly have such a particle. We might call this dark energy. However that is outrageous speculation.
Fixation on the Einstein papers is a good definition of OCD.

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Offline LarryLee Booth

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quantum entanglement could be a hint. it could have a
 possible explanation if the information is moving faster than light.

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Online chiralSPO

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quantum entanglement could be a hint. it could have a
 possible explanation if the information is moving faster than light.

But quantum entanglement does NOT involve faster than light information transfer!