Magnetic Monopole

  • Thread starter Redsummers
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  • #1
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Main Question or Discussion Point

Hello,

First I would like to introduce a brief definition of such a particle from Wikipedia:

A magnetic monopole is a hypothetical particle in physics that is a magnet with only one pole (see Maxwell's equations for more on magnetic poles). In more technical terms, it would have a net "magnetic charge." Modern interest in the concept stems from particle theories, notably the grand unification theory and superstring theories, which predict their existence.

The magnetic monopole was first hypothesized by Pierre Curie in 1894, but the quantum theory of magnetic charge started with a 1931 paper by Paul Dirac. In this paper, Dirac showed that the existence of magnetic monopoles was consistent with Maxwell's equations only if electric charges are quantized, which is observed. Since then, several systematic monopole searches have been performed. Experiments in 1975 and 1982 produced candidate events that were initially interpreted as monopoles, but are now regarded as inconclusive.
Now, my question is how would magnetic monopoles be detected? Does anyone of you know about more properties of these particles for a better understanding?
 

Answers and Replies

  • #3
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I read of an experiment to detect monopoles.
The equipment was a superconducting ring.

If a bar magnet is dropped through the ring longways the first pole induces a voltage
that causes a circulating current.The second pole induces a reverse voltage which exactly
cancels the current from the first pole.

With a monopole any current would not be canceled.
A current would circulate continuously in the ring.

The experimenters just needed to wait.I expect the ring was electronically monitored.

They did get one hit for the duration of the experiment but only one.

I think it was reported in Scientific American a very long time ago.
 
  • #4
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I don't know the answer and the article might not give it, but it could be a starting point:
http://www.sciencedaily.com/releases/2010/03/100324142119.htm
Oh, whoa it was on the news just yesterday, pure coincidence. I didn't know really that there was this group in CERN investigating that particle. Anyway, tomorrow is going to be an important day in LHC, we will see.


I read of an experiment to detect monopoles.
The equipment was a superconducting ring.

If a bar magnet is dropped through the ring longways the first pole induces a voltage
that causes a circulating current.The second pole induces a reverse voltage which exactly
cancels the current from the first pole.

With a monopole any current would not be canceled.
A current would circulate continuously in the ring.

The experimenters just needed to wait.I expect the ring was electronically monitored.

They did get one hit for the duration of the experiment but only one.

I think it was reported in Scientific American a very long time ago.
Thanks, I will definitely search the Scientific American if they have the article uploaded. Sounds like an interesting procedure to seek for the monopole, even though quite different from the one stated above.
 
  • #5
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Without a little cheating, the existence of free magnetic monopoles is at odds with the proven existence of an electromagnetic vector potential as supported by electron interference experiments.
 
  • #6
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Years ago, I was told by a Physicist, "Monopoles only occur in Texas". This was based on some indirect evidence. I'm not sure if this is the experiment he was refering to:

http://adsabs.harvard.edu/abs/1986isos.book..435S

Here may be a better link:

http://www.ph.utexas.edu/~niugroup/files/monopoles.pdf [Broken]
 
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  • #7
jtbell
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They did get one hit for the duration of the experiment but only one.
This was in 1982, and is known as the "Valentine's Day monopole." A Google search turns up a number of references to this experiment.
 
  • #8
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Hi all, new kid on the block.

Supposedly, and shown in some (less than totally conclusive) Youtube video's, Rodin type toroid coils seem able to generate monopoles, and have steel rods remain to be magnetized as such. Good north pole is detected, but no south.
Certainly some odd things happen in all kinds of applications with Rodin coils, but strong and true monopoles would let a toddler build a self running electric motor. So, what will the truth be?
 
  • #9
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Hi all, new kid on the block.

Supposedly, and shown in some (less than totally conclusive) Youtube video's, Rodin type toroid coils seem able to generate monopoles, and have steel rods remain to be magnetized as such. Good north pole is detected, but no south.
Certainly some odd things happen in all kinds of applications with Rodin coils, but strong and true monopoles would let a toddler build a self running electric motor. So, what will the truth be?
I also have a piece of swamp-land in Florida that spontaneously produces magnetic monopoles. I'll sell to the highest bidder. I accept PAYPAL, and all sales are final. :biggrin:
 
  • #10
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Seriously! I didn't even think there were so many ways of endeavouring to observe magnetic monopoles lol. Oh well, it's already 30th here in Europe, we just have to wait few more hours for LHC... even though it may take days until the first collision.

I also have a piece of swamp-land in Florida that spontaneously produces magnetic monopoles. I'll sell to the highest bidder. I accept PAYPAL, and all sales are final. :biggrin:
wuut!
 
  • #11
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wuut!
Wow! You "wuut" the swamp land, but not the Rodin coil? :surprised
 
  • #12
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Wow! You "wuut" the swamp land, but not the Rodin coil? :surprised:
I actually lol'd at the rodin coil. But oh well, I'm not really into buying swamp lands though O:
 
  • #13
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I actually lol'd at the rodin coil. But oh well, I'm not really into buying swamp lands though O:
Excellent! My scam can't work without a good number of detractors to point to and identify as the "establishment" trying to suppress the truth. :smile:
 
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  • #14
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Excellent! My scam can't work without a good number of detractors to point to and identify as the establishment trying to supress the truth. :smile:
lol, maybe your swamp keeps some kind of mysterious fungus which may surprise biologists O: but as far as I know I don't think Dirac would be surprised by your swamp-creating-monopoles xD
 
  • #15
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These particles can not be detected, as monopole do not exist. It is mathmatically hypothetical to detect ( existance) these monopoles from maxwell's equation ... Divergence of B is equal to zero
 
  • #16
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Seriously! I didn't even think there were so many ways of endeavouring to observe magnetic monopoles lol. Oh well, it's already 30th here in Europe, we just have to wait few more hours for LHC... even though it may take days until the first collision.
When will the results be in?
 
  • #17
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These particles can not be detected, as monopole do not exist. It is mathmatically hypothetical to detect ( existance) these monopoles from maxwell's equation ... Divergence of B is equal to zero
What are you basing on to say that such a hypothetical particles do not exist? I am afraid that something similar happened with Dirac at the prediction of anti-electrons (positrons), and at the end it turned out that positrons really existed.

When will the results be in?
I don't know really, but I will ask a friend I know who works in CERN. But the first collisions have been achieved today at 13h here in European time (+1GMT).

I recommend to everyone around to check the live-stream of LHC, even though they will stop broadcasting in 3 hours.

http://webcast.cern.ch/lhcfirstphysics/ [Broken]
 
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  • #18
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Neutron scattering experiments on spin ice systems are now claiming to see monopoles. Though technically I think these are quasiparticle excitations with a monopole charge (but don't quote me on that). There was a paper in Nature Physics not that long ago, you should be able to google it.
 
  • #19
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I don't think these spin configurations deserve the name monopole. In a way it's just a moving loose poles. They call it "particle" and to make the story more interesting they put monopole in the headline.
http://www.nature.com/nature/journal/v451/n7174/abs/nature06433.html

It's nowhere near real particles or what the LHC is trying to find.
 
  • #20
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  • #21
from where can i know the result of the LHD experiment?
 
  • #22
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from where can i know the result of the LHD experiment?
It's not that they are going to interpret the results and all the data in two weeks. However that's what I've have read so far:

Expected results

CERN scientists estimate that if the Standard Model is correct, a
single Higgs boson may be produced every few hours. At this rate, it
may take about two to three years to collect enough data to discover
the Higgs boson unambiguously. Similarly, it may take one year or more
before sufficient results concerning supersymmetric particles have
been gathered to draw meaningful conclusions.
So, it may take years.
 

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