- #1
tade
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I was watching a video of Michio Kaku. He said that when you go faster than light, time goes backwards and objects have negative mass.
Does SR really predict such FTL effects?
Does SR really predict such FTL effects?
Dick said:Kaku has become a media shill for bizarre intrepretations of physics. He'll say whatever they want him to say if it fits their programming. So he can be on TV.
tade said:He's not a shill in the sense of misleading customers to buy things, but I agree that he is a "media man".
And also a bit of a sensationalist attention-seeker.
He's not the only one though. Even some supposedly respectable physicists have taken the same route.
HomogenousCow said:Back on topic, there is no answer to your question OP.
Massive particles simply do not travel at or beyond the speed of light, it is similar to asking a question like "What if the magnetic field had non zero divergence", it would just be a different physical model.
I think it's perfectly within character. Nah, have some dignity.Dick said:Sure. I've got his quantum field theory book. Which is really not bad. It's just odd to see him on the Discovery Channel spouting garbage. I suppose if somebody offered me the right price, I might do it.
tade said:I think it's perfectly within character. Nah, have some dignity.
Dick said:I'll shed it. What's it worth? In $$?
HomogenousCow said:Anyone can write a pop science book for layman, simply follow these great steps.
1.Find a picture of a black hole, hydrogen atom or some equations (preferably with some greek indices, the EFE work well) and make it the front cover
2.Use these words frequently and in any context:
Quantum, Energy, Negative, Space-time (Or its more awesome cousin, "space time continuum" ), Einstein, Feynman, Black holes, dark matter, entanglement
3.Publish and make millions
(Or not, in which case add a few chapters on time travel and teleportation)
4.Lose all respect in the science community
Congratulations! Now you too can become a popularizer of science.
WannabeNewton said:The notion of "time going backwards" in the case of FTL travel is a standard SR problem in textbooks; it involves a simple exercise in spacetime diagrams (but a very fun one). The point of the problem is to show that if you do assume FTL travel then causality is violated thus yielding a contradiction. Let's be careful before making overly sarcastic remarks.
Yes: http://en.wikipedia.org/wiki/Tachyonic_antitelephonetade said:is it the antitelephone?
WannabeNewton said:
Brute Force said:The speed faster than light speed were observed in many experiments. (Speed of light in the media of coarse)
The particle moving faster than light starts to emitt "Cherenkov radiation".
No time reversing were observed so far.
Nugatory said:It's the speed of light in vacuum that matters here.
It's worth adding that light traveling through a medium is a completely different phenomenon than light traveling through a vacuum; when we say "speed" we're not even talking about the same thing in the two cases. Light passing through a medium is continuously interacting with the atoms of the medium, propagating at c through the vacuum between the atoms and then being absorbed and re-emitted, scattered in various directions, and generally not doing anything that looks like the smooth propagation of electromagnetic waves through vacuum that Maxwell's equations and special relativity deal with.
tade said:kaku's statements are still crap right?
Harry Wilson said:Well, you haven't said exactly what his statement was.
If you go faster than c, you do go back in time, so no; I think he's right. It's just actually achieving that speed is, in all current theory, impossible.
Harry Wilson said:If you go faster than c, you do go back in time,.
Faster-than-light travel refers to any mode of transportation that is capable of exceeding the speed of light. This is currently considered impossible according to the laws of physics, as the speed of light is believed to be the maximum speed at which any object can travel.
At this time, there is no scientific evidence or technology that supports the possibility of FTL travel. The theory of relativity, which has been extensively tested and proven, states that the speed of light is the ultimate speed limit in the universe. However, some scientists continue to research and explore the concept of FTL travel through theoretical models and experiments.
Theories such as wormholes and warp drive, while often associated with FTL travel, do not actually involve exceeding the speed of light. Rather, they involve bending or warping the fabric of space-time to create shortcuts or accelerate travel between two points. These concepts are still highly theoretical and have not been proven to be possible.
The potential consequences of FTL travel are largely unknown and purely speculative. Some theories suggest that it could violate causality, allowing events to occur before their causes, which could lead to paradoxes and disruptions in the fabric of space-time. Additionally, the extreme speeds and forces involved in FTL travel could have detrimental effects on the human body and any technology attempting to achieve it.
No, there are no confirmed examples of FTL effects observed in our universe. Some phenomena, such as quantum entanglement, appear to have instantaneous effects at a distance, but this does not violate the speed of light as no physical object is actually traveling. Other observations, such as the apparent faster-than-light expansion of the universe, can be explained by other factors such as the expansion of space itself.