# Will Dirac's phone ever work?

## Would it be possible in near future to make a device that can send info back in time

Poll closed May 17, 2012.

18.2%

81.8%

0 vote(s)
0.0%
4. ### It migth, depend on how to solve obstacles in physics

0 vote(s)
0.0%
1. May 12, 2012

### Nysgjerrig

I read in article done by prof. Tom Weiler and Chui Man Ho that suggest the possiblity to use the LHC in CERN as a time machine. The concept is using the LHC to send messages back in time with use of LHC and particle that migth exist, called singlet bosson. That said, both emphasizes that this could be a long shot. But my questions is: Could it be done? Is it even possible to do it? I have heard of Dirac's phone. That makes it possible call back in time. But I never seen reseach who acctually tried that. I know it sounds weird and it is on the edge of all known physics. But I see on treads before that some of the issues concerning this topic has been discussed before but not accutally this one.

2. May 12, 2012

### PAllen

Dirac just needs a better phone plan.

3. May 12, 2012

### Naty1

and perspectives on science change over time:

said one of the great scientists of his day...I forget who, an Englishman I think, because air would be sucked out or you. !!!

4. May 12, 2012

### Nysgjerrig

Michio Kaku claims it could be possible but would take many years to make that happen (at least 100 years from now). Of two reasons 1) the amount of energy that is involve to bost enough force to make a particle that is suitable to the task(f ex a singlet bosson or tachyons) to leap over to another dimensions 2)We have to figure out how the laws of quantum physics work (f ex making a law of quantum gravity).

5. May 12, 2012

What exactly is Dirac's phone? The only relevant google search result is this topic.

6. May 12, 2012

### yanom

have fun.

7. May 12, 2012

### phinds

If Kaku claims it will be possible in at least 100 years from now, my first reaction is to believe that it will therefore be more like 1000 years.

He used to be an actual scientists but he is now a popularizer of the worst sort. There are numerous threads on this board that warn about trusting anything he says. But he is VERY entertaining, I must admit.

8. May 12, 2012

### Nysgjerrig

The Dirac's phone or more precisely Dirac's radio (after the English mathematical physics Paul Dirac) is a device who described in a SF story written by David Blish's ("Beep") that describe a radio transmission that always ends with a irritating audio beep. The main character in the story discover that this beep is accutally from a special fequency spectrum from 30 hertz to 18000 hertz. That spectrum this signal is sending is in fact a signal from the future to the past. The story try to elaborate some of the works from Feynman and Wheeler on advanced waves. Some physicists (for instance prof. Tom Weiler) claim that it could be possible to send messages back in time with the rigth tool. That could be Dirac's phone or radio.

9. May 12, 2012

### Nysgjerrig

I am agree to that. He migth be more entertainer then physicist. But some of his works is acctually good (like his Hyperspace/multispace theory)

Last edited: May 12, 2012
10. May 13, 2012

### gopolks

I thought he was well respected, doesn't Hawkings think highly on him?

11. May 13, 2012

### Octavianus

Since we, as far as I know, haven't received any messages from the future: NO.

12. May 13, 2012

### gopolks

Yep thats the thing that sorts of prove we cant go back or send things back in time, as hawkings said you cant have effect before cause.

Going forward in time though, is a different story.

13. May 13, 2012

### phinds

Hawking is a very serious physicist. I don't think ANY serious physicists take Kaku seriously TODAY. Twenty years ago, yes, but not now.

14. May 13, 2012

### Nysgjerrig

Whys that? What have changed since he started at Univeristy of Califonia? I think he did some good work when he developed the string filed theory together with othe scienctist. I belive he could be rigth regarding the Dirac's phone too. But that will take some time before we reach that state in physics. That means that relativity theory and quatum physics must be one theory that combine both (M-theory or a better one). Regarding the fact we havn't heard anything yet dosn't mean that they havn't tried. I think the rules to not mess around with the past will be essential here when they in the future try to send messages back in time. And who would belive it first time we hear a signal we don't recognize immediately as signal we are used today and then signal giver claims that he/she sending from the future? I would be skeptical first time I encounter a signal from the future. I guess that goes for many of us too.

15. May 13, 2012

### phinds

Do a forum search

16. May 13, 2012

### feynmanisbest

Sending information back in time is, in principle, impossible. I am trying to think of an analogy of something that is impossible to the point of absurdity but all I can come up with is "it's as absurd as backward time travel."

Lol, I can try to do better than that. It's like asking, "what if the ratio of a circle's circumference to it's diameter was not pi but, say, i, or infinity?"

The question is not a deep philosophical one, it's just absurd. There isn't any future technology that will allow engineers to build circles with infinite circumferences. Somehow I feel confident of that despite the fact that people in the past felt confident about things like high speed rails and were disproved.

17. May 13, 2012

### Mark M

Keep in mind the most important rule in all of physics: Paradoxes do not occur.

So, the only way I could possibly imagine information could be sent into the past without a paradox is via closed timelike curves. Which have been ruled out, see here.

18. May 13, 2012

### Nysgjerrig

Well, I have seen physicists that have claim that before and yet find a problem that occur as a paradox. One example is particles that exceed the speed of ligth (G.Nimtz, 2011). That shouldn't be possible according to the relativity theory. Another example is Diracs own equation that unified some of the relativity theory and quantum physics. According to Einstein that couldn't be possible since the quantum physics was wrong. So there are lot of things that appear as a paradox and later on isn't a problem anymore. Regarding to CTC, there are physicists that claim that CTC time machine is possible (Bryan W.Roberts, 2008 or Ian T. Durham, 2008). But I agree with the fact that at present there is no technology and knowledge to solve the problems regarding to CTC time machine or other suggestions that have been made toward to making a time machine.

19. May 19, 2012

### Nysgjerrig

Gμ$\nu$=8[itex]\piT\mu\nu9
This is first step to a solution of Einstein filed equations (c = G = 1)