Einstein's special relativity beyond the speed of lightby bohm2 Tags: einstein, light, relativity, special, speed 

#1
Oct1012, 11:27 AM

PF Gold
P: 670

Not sure if this was posted but this seems like an interesting paper. Then again, I'm not well read in this topic to judge their arguments:
http://rspa.royalsocietypublishing.o...rspa.2012.0340 Physicists extend special relativity beyond the speed of light http://phys.org/news/201210physici...tvelocities:v/ Extending Einstein's Theory Beyond Light Speed http://www.sciencedaily.com/releases...1010092742.htm 



#2
Oct1012, 03:29 PM

P: 5,634

Lots of math turns out not to have a physical basis....
It appears only the abstract is available for free... 



#3
Oct1012, 03:52 PM

PF Gold
P: 670





#4
Oct1012, 06:14 PM

Emeritus
Sci Advisor
PF Gold
P: 5,500

Einstein's special relativity beyond the speed of light
I find it hard to work up any motivation to worry about a paper that's published in a lowimpact, paywalled journal, not available on arxiv, and appears to be a rehash of a topic that's already been carefully studied and found to be uninteresting.
The possibility of defining superluminal frames of reference (as opposed to just describing superluminal particles) has been studied for a long time. There is a nogo theorem described by Vieira, which says that it only works in n+n dimensions. It doesn't work in 3+1 dimensions. The physics.SE thread discusses the fact that this objection also applies to Hill and Cox's work. Vieira, An Introduction to the Theory of Tachyons, 2011, http://arxiv.org/abs/1112.4187 



#5
Oct1212, 02:52 PM

P: 32





#6
Jan1113, 01:16 AM

P: 2

Phys.org article: http://phys.org/news/201210physici...elativity.html
Link to the paper: http://rspa.royalsocietypublishing.o....0340.abstract Any comments from the Physics gurus? My knowledge reagarding SR is somewhat limited. So your comments would be appreciated. Thanks. 



#7
Jan1113, 06:47 AM

Sci Advisor
Thanks
P: 3,857

Nothing of interest. Except it does serve to illustrate how much popular attention you can garner with the words "faster than light".
If you like, here's the full paper. 



#8
Jan1113, 08:41 AM

P: 3,551

I didn't read it, just looked at Fig. 4. If I understand correctly:
v : Velocity of frame B relative to frame A u : velocity in frame B U : velocity in frame A Is that right? Lets say a rocket fires a missile from it's nose launcher. The missile moves at u = 0.5c relative to the rocket. But In a frame where the rocket moves at v=4c the missile is slower than the rocket (U < 4c) and stays behind it, or destroys it right after launch. How is that resolved?. Is the entire rocket mirrored in the frame where it moves FTL? Negative length contraction? 



#9
Jan1113, 10:29 AM

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PF Gold
P: 5,500

We discussed this back in October: http://www.physicsforums.com/showthread.php?t=642823 The paper is wrong.




#10
Jan1113, 10:35 AM

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PF Gold
P: 5,500

Here is a recent note that points out what Cox and Hill did wrong:
Andréka, 'A note on "Einstein's special relativity beyond the speed of light" by James M. Hill and Barry J. Cox,' http://arxiv.org/abs/1211.2246 The criticism is essentially the same as in this thread and the physics.SE thread: the idea only works in n+n dimensions, not 3+1. But Andréka, like Cox and Hill, doesn't seem to realize that this was all settled way back in 1986 by Recami. Obviously the RSPA doesn't have very high standards or very knowledgeable reviewers if they accept this kind of paper, which is both wrong and wrong for reasons that have been known and published in the literature for 25 years. 



#12
Jan1113, 12:00 PM

P: 2

It seemed somewhat suspicious so I thought to confirm the results with you guys. :) 


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