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Topic: Monopoles


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In the News (Mon 13 Feb 12)

  
  Magnetic monopole - Wikipedia, the free encyclopedia
In physics, magnetic monopole is a term describing a hypothetical particle that could be quickly clarified to a person familiar with magnets but not electromagnetic theory as "a magnet with only one pole".
A hypothetical isolated magnetic pole is called a magnetic monopole; it has been theorized that such things might exist in the form of tiny particles similar to electrons or protons, forming from topological defects in a similar manner to cosmic strings, but no such particles have ever been found.
Non-inflationary Big Bang cosmology suggests that monopoles should be plentiful, and the failure to find magnetic monopoles is one of the main problems that led to the creation of cosmic inflation theory.
en.wikipedia.org /wiki/Magnetic_monopole   (838 words)

  
 Talk:Magnetic monopole - Wikipedia, the free encyclopedia
The magnetic monopole article has a link to charge in the first sentence, referring to "magnetic charge", but there is only an article on "electric charge".
An isolated magnetic pole is called a magnetic monopole; it has been theorized that such things might exist in the form of tiny particles similar to electrons or protons, but no such particles have ever been found.
Referring to [2]: it's not necessary for even a single magnetic monopole to be present in the universe, there only needs to be the potential for one to exist.
en.wikipedia.org /wiki/Talk:Magnetic_monopole   (1179 words)

  
 Direction finding antenna and system - Patent 4161736
One of the monopoles preferably is connected to the ground plane by a terminating resistor, defining the antenna terminated end, the other monopole being connected to a receiver through an impedance transformer, defining the antenna output end.
In operation, a radio signal from a remote source impinges first on the monopole of an antenna closest to that signal, and induces a current in the monopole which is then conducted by the transmission line to the second monopole of that antenna.
Also in the embodiment illustrated, the monopole 14 is connected to a receiver circuit (not shown) by a coaxial connection 34, the monopole 16 being connected to ground through a resistance 36, equal to the characteristic impedance of the receiver input circuit.
www.freepatentsonline.com /4161736.html   (3096 words)

  
 Asymptotic Metrics for SU(N)-Monopoles with Maximal Symmetry Breaking (ResearchIndex)
6.3: Monopoles and the Gibbons-Manton Metric - Bielawski (1998)
1 Monopoles and the Gibbons-Manton metric - Bielawski
Monopoles and the Gibbons-Manton Metric - Bielawski (1998)
citeseer.ist.psu.edu /bielawski98asymptotic.html   (615 words)

  
 sc_mm
But the question of whether or not magnetic monopoles exist has a certain amount of intellectual baggage that goes along with it that needs to be corrected.
One might say: "Do magnetic monopoles exist like electric monopoles exist?" Clearly, there is a belief that electric monopoles exist in isolation and that people consider that individual or discrete elementary charged particles are examples of electric monopoles.
A monopole would only be a north or south pole, with no accompanying opposite pole, not unlike a normal electric charge.There have been some interest in the possibility of monopoles, mainly for theoretical purposes.
www.geocities.com /ashokktiwari/sc_mm.html   (1988 words)

  
 Monopoles and the Gibbons-Manton Metric - Bielawski (ResearchIndex)
Monopoles and the Gibbons-Manton Metric - Bielawski (ResearchIndex)
We show that, in the region where monopoles are well separated, the L 2 -metric on the moduli space of n-monopoles is exponentially close to the T n -invariant hyperkahler metric proposed by Gibbons and Manton.
9 Nahm's equations and the classification of monopoles (context) - Donaldson - 1984
citeseer.ist.psu.edu /bielawski98monopoles.html   (663 words)

  
 Topological Defects
There are a number of possible types of defects, such as domain walls, cosmic strings, monopoles, textures and other `hybrid' creatures.
Monopoles are predicted to be supermassive and carry magnetic charge.
The existence of monopoles is an inevitable prediction of grand unified theories (GUTs); this is one of the puzzles of the standard cosmology.
www.damtp.cam.ac.uk /user/gr/public/cs_top.html   (1046 words)

  
 Interaction of 16 monopoles - symmetrical   (Site not responding. Last check: 2007-11-07)
The motion of each monopole is therefore determined by the 15 other monopoles and by the 'reflections' of all monopoles in the walls.
The result is that some monopoles join with oppositely signed monopoles and form dipolar structures, while other monopoles are torn apart and merge with monopoles of the same sign to form larger monopoles.
The result of this is that the monopole starts moving along an ellips-like path around the centre; the closer to the wall it starts, the faster it moves.
www.fluid.tue.nl /users/jos/VDG/mn2-main.html   (500 words)

  
 CERN Courier - MACRO delivers its final wor - IOP Publishing - article
During the 1970s, monopoles appeared on the scene again, when theorists found that electric charge is naturally quantized in gauge theories that unify the strong and the electroweak interactions (GUTs).
The GUT monopole is a complicated object with a very small core and different surrounding regions.
Because of the smallness of the monopole's core this should be a very rare phenomenon, but if there are baryon number violating terms in the four-fermion virtual condensate around a GUT monopole of up to 1 fm radius, the cross-section could be large and the phenomenon could be observed.
www.cerncourier.com /main/article/43/4/11   (836 words)

  
 FractalComs
All of the monopoles are designed as self-resonant antennas, so they do not need any external load to cancel out the reactive part of their input impedance.
A close look at the results reveals that the resonant frequency of a Koch monopole is higher than that of a straight monopole of the same wire length and the reduction factor in the resonant frequency of the Koch antenna as the iteration number increases tends monotonically to one.
This work investigates further in the dependence of the resonant frequency with the monopole geometry, in order to acquire guidelines for the design of self-resonant small antennas, in which an increase of the wire length effectively leads to a reduction in the resonant frequency.
www-tsc.upc.es /fractalcoms/t11.htm   (3079 words)

  
 Physics 230 Course Information
Monopole scattering at low velocity in the moduli space approximation.
Intrinsic breaking of the U(1) symmetry due to monopoles drives confinement: the photon becomes a massive pseudo-Goldston boson, and a global string becomes the boundary of a domain wall (elecric flux tube world sheet).
Charge-N magnetic monopoles as the mechanism for confinement and the mass gap in (2+1)-dimensional Yang-Mills theory.
theory.caltech.edu /people/preskill/ph230   (1525 words)

  
 ess
He related the existence of monopoles to the phases of quantum waves and proposed that magnetic monopoles might exist with multiples of the magnetic unit charge.
The necessity of magnetic monopoles in these theories was shown by the Dutch physicist G. t’Hooft and by the Russian physicist Alexander Polyakov.
Furthermore a monopole would not be a pointlike particle and it would posses a rather complex structure [4].
www.physik.tu-dresden.de /~jseidel/es.html   (956 words)

  
 Interaction of 16 monopoles - not symmetrical   (Site not responding. Last check: 2007-11-07)
Apparently some monopoles join with oppositely signed monopoles and form dipolar structures, while other monopoles are torn apart and merge with monopoles of the same sign to form larger monopoles.
If in the initial state the 16 monopoles are placed symmetric around the centre, the resulting evolution remains symmetric, as Interaction of 16 monopoles - symmetrical shows.
The overall behaviour of the monopoles is the same if no-slip walls are used as boundary conditions, but the details are not: no-slip walls generated oppositely signed vorticity near the walls with which the monopoles interact when they reach the walls.
www.fluid.tue.nl /users/jos/VDG/mn3-main.html   (532 words)

  
 Internet Infidels Discussion Forum: Is magnetism a relativistic phenomenon?   (Site not responding. Last check: 2007-11-07)
Even the theories that postulate magnetic monopoles do not say that they are the cause of magnetism in normal matter--they are expected to be pretty rare, I believe.
The existence of magnetic monopoles might just demonstrate that the relation between coulomb and magnetic forces is completely symmetrical, since uncharged magnetic monopoles would presumably generate a coulomb force when you move them around, as a consequence of relativity again.
The relevance of this is that the magnetic monopoles predicted in GUT's are also topological solitons, though the configuration in three dimensional space is more difficult to visualise than for the one dimensional of the clothes line.
www.iidb.org /cgi-bin/ultimatebb.cgi?ubb=get_topic&f=57&t=000556   (3041 words)

  
 Magnetic monopoles as engines for cosmological inflation   (Site not responding. Last check: 2007-11-07)
Previous theoretical studies of monopoles have all considered them to be point-like objects that were too small to be affected by inflation.
If the initial inflationary region is visualized as a bubble, then each monopole creates a new bubble extending from the original and, in the process, creates new monopole pairs which begin creating other new bubbles, and so on for eternity.
The possibility that monopoles by themselves solve the monopole problem is so simple that it certainly deserves further in vestigation," Linde said.
www.stanford.edu /group/news/relaged/940517Arc4260.html   (891 words)

  
 Monopole FAQ   (Site not responding. Last check: 2007-11-07)
The number of monopoles predicted can be significantly smaller if the Universe is also expanding exponentially at the point in Big Bang where monopoles would have formed.
Then there may be as little as a few monopoles (or none), or many more monopoles may have been created during a later "reheating" phase.
So the easiest way to look for monopoles is to build a big detector and then to look for things that take a long time to cross it.
budoe.bu.edu /~corth/monopole_faq.html   (1112 words)

  
 Physics and Astronomy Forums - Magnetic Monopoles - General Physics Discussion
So, as the mass of such a monopole should be very high, the search for it will be a matter of high energy physicists, not solid state researchers.
Monopoles are classical objects, they are a special kind of soliton.
So if there is a monopole solution to a wave equation, there should be a current and a conserved charge which makes the monopole stable (I dont know much, as I said earlier, about monopoles, but what I say here should ar least be true if you consider ´t Hooft monopoles).
www.physlink.com /Community/Forums/viewmessages.cfm?Forum=17&Topic=1721   (1609 words)

  
 [No title]   (Site not responding. Last check: 2007-11-07)
We present an argument that all orientable 3-manifolds should be consistent with a very wide class of possible laws of physics; but almost all $n$-manifolds for almost all $n \ne 3$ won't be.
This is perhaps a ``reason the world is 3 dimensional.'' Next we argue that if point monopoles exist, and Dirac's wave equation of quantum mechanics holds, then a contradiction arises.
Hence monopoles cannot exist -- or: they are not points; or: Dirac's equation for quantum mechanics is not correct.
www.math.temple.edu /~wds/homepage/chargequant2.sue   (281 words)

  
 Monopoles or vortices?
monopoles are of codimension 3, vortices are codimension 2 objects.
This contradicts to the notion that the monopole gas is responsible for disordering Wilson loops.
These monopoles, however do not form a random gas, but rather they are aligned in a network of chains of alternating monopoles and antimonopoles.
www.physics.uc.edu /suranyi/conf-lectures/node26.html   (433 words)

  
 Carpati Original Romanian tobacco cigars cigarettes brand SNTR S.N.T.R. Webdesign RObitHooD Made in Romania   (Site not responding. Last check: 2007-11-07)
In this Ministry was created the General Division of State Monopoles Administration, this special division have a number of eight members and one manager.
From all the monopoles of State Monopoles Administration, the most important was the tobacco monopole, giving it a special attention in order to extend tobacco cultivated fields, increase production, control and quality improvement.
At the end of 1919 the factory was moved under authority of State Monopoles Administration, this bring new machines for: cutting tobacco, sharpening knifes, for pocketing packs, dust aspiration, rolling cigarettes.
carpati.go.ro /carpati_story_en.htm   (1725 words)

  
 Monopoles inside a proton?
So when you read his drivel about monopoles and the structure of the proton - for which he provides no mathematical or experimental justification - a much more reasonable question would be "Why on earth would I be even *tempted* to believe this?".
Typically even someone with a PhD in physics is not necessarily conversant in group theory unless they are a theorist, and even most of those have never heard of quaternions, for example.
These monopoles = communicate with each other via "scalar waves" in a complex = manner, thereby accounting for the nuclear forces well known = in physics." = = c NO.
www.pych-one.com /new-5402873-4394.html   (1496 words)

  
 Monopoles and Fairfax County Public Schools
Details about the locations of existing and planned poles are included in the monopole fact sheet.
The process of placing a monopole on an FCPS site begins with the Fairfax County Planning Commission.
The emissions from monopole sites currently on FCPS property have been assessed and found to be well below federal guidelines.
www.fcps.edu /ocr/monopole   (243 words)

  
 About the MACRO experiment   (Site not responding. Last check: 2007-11-07)
The specialty of MACRO is the search for magnetic monopoles: particles with bare north or south magnetic charge.
These particles are a natural consequence of Grand Unified Theories, which also predict that the monopole will be very massive: perhaps 10^16 GeV.
Such particles can only be produced by the intense energies available during the big bang.
hep.bu.edu /~macro/about.html   (303 words)

  
 Evidence for Monopoles   (Site not responding. Last check: 2007-11-07)
That is, a sudden increase in the current in the coil which is maintained because of the very small resistance of the coil.
A monopole candidate event with a very similar signature to that observed by Cabrera (shown above) was observed by a group using ssuperconducting ring monopole detector at Imperial College, London.
Again, the observed jump in the measured flux was completely consistent with the passage of a magnetic monopole through one of the coils.
moedal.web.cern.ch /moedal/evidence_for_monopoles.htm   (426 words)

  
 Citebase - Cyclic Monopoles
With this data both analytical and numerical approximate ADHMN constructions are performed to study the zeros of the Higgs field and the monopole energy densities.
The analysis is largely in terms of the spectral curves, the rational maps, and the Nahm equations associated with monopoles.
We discuss the similarities between BPS monopoles and Skyrmions, and point to an underlying connection in terms of rational maps between Riemann spheres.
citebase.eprints.org /cgi-bin/citations?archiveID=oai:arXiv.org:hep-th/9610030   (1035 words)

  
 Have physicists seen magnetic monopoles? (October 2003) - News - PhysicsWeb
Dirac linked the existence of magnetic monopoles with the quantization of electric charge - another puzzle that is still not fully understood - but they have never been detected in an experiment.
Magnetic monopoles are also predicted by some theories that seek to unify the electroweak and strong interactions.
The team was motivated by recent theoretical work which suggested that the behaviour of magnetic monopoles in momentum space is closely related to the anomalous Hall effect.
physicsweb.org /article/news/7/10/2   (537 words)

  
 monopole_prices
This allows the Monopole® to be installed into appliances with panel thicknesses up to 3.5mm thick.
Manufacturers have their Monopoles® similarly wrapped initially except that the full order f individually wrapped Monopoles® are all placed in the same packaging box (no more than 150 per carton).
All Gold and Fine Silver Monopoles® are supplied with colour coded Glass Impregnated Teflon insulation in place of the Delrin as on the standard Monopoles®.
www.physics.adelaide.edu.au /~mferrare/best/prices/monopole_prices.htm   (431 words)

  
 Single user and multi user monopoles from 12m to 36m   (Site not responding. Last check: 2007-11-07)
Levacom’s series of single-user and multi-user monopoles is one of the most comprehensive in the industry, from a 12m lightweight unit for a 3G cellular base station, to a 36m multi-occupancy unit offering extensive mobile and microwave facilities.
A popular configuration for multi-occupancy sites is the extendable monopole which allows the structure to grow in height as demand for antenna space increases.
In addition, we can supply customised monopoles which are ideal for sites where the antenna support structure is required to blend in and complement its surroundings.
www.levacom.com /monopoles.asp   (216 words)

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