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byron178
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When something has a phase velocity greater than the speed of light,will it travel backwards in time in one frame?
ghwellsjr said:Nope.
Hmm, how do you conclude that?ghwellsjr said:Nope.
No, it doesn't. It says the normal matter cannot travel faster than light (in any frame).byron178 said:but relativity says that if something were to travel faster than light than in one frame it will travel backwards in time.
I would agree with that but do you think that that would imply that the phase does not go backwards in time in another frame?HallsofIvy said:No, it doesn't. It says the normal matter cannot travel faster than light (in any frame).
Passionflower said:I would agree with that but do you think that that would imply that the phase does not go backwards in time in another frame?
Apparently then the problem is that you do not understand what "phase" velocity means. "Phase" velocity is a property of a wave. There is nothing with mass moving at the "phase" velocity of a wave.Passionflower said:I would agree with that but do you think that that would imply that the phase does not go backwards in time in another frame?
Yes, and I implied that that was not the case?HallsofIvy said:"Phase" velocity is a property of a wave. There is nothing with mass moving at the "phase" velocity of a wave.
Passionflower said:Yes, and I implied that that was not the case?
Phase velocity can be observed, and thus it can also be observed in many frames of reference.
Yes I am aware of that.mathfeel said:Plenty of things can be observed to be faster than speed of light. But they don't transmit information or matter.
Phase velocity is the speed at which a wave travels through a medium. It is not directly related to time travel, as time travel is a concept that is still largely theoretical and not fully understood by science.
No, according to the theory of relativity, the speed of light is the maximum speed at which any object can travel. Therefore, phase velocity cannot be faster than the speed of light.
Currently, there is no scientific evidence or theory that suggests that manipulating phase velocity can lead to time travel. The concept of time travel is still a topic of ongoing research and exploration.
Studying phase velocity and time travel can help scientists better understand the fundamental properties of the universe and potentially lead to advancements in fields such as astrophysics and quantum mechanics.
Phase velocity is typically measured using specialized equipment such as oscilloscopes and phase meters. These instruments can detect the changes in phase of a wave as it travels through a medium and calculate the velocity based on those changes.