Faster than speed of light

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Joined: Fri May 05, 2017 8:58 am

Faster than speed of light

Postby JimmyThyJoker » Thu Aug 24, 2017 5:54 pm

Phase velocity can be faster the speed of light while the group velocity can't.
Which waves of the group are actually travelling at the phase velocity? If we can find them, aren't we going to be able to break the speed barrier?

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Joined: Wed Nov 01, 2017 11:27 pm

Re: Faster than speed of light

Postby dochang » Wed Nov 01, 2017 11:33 pm

An arbitrary wave can be decomposed mathematically into a summation of sines and cosines. Sometimes the decomposition can result in waves that have phase velocities faster than the speed of light. This is a completely mathematical procedure and doesn't always have any physical meaning.

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