Randall–Sundrum model: Difference between revisions

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In [[physics]], a '''Dirac string''' is a hypothetical one-dimensional curve in space, conceived of by the physicist [[Paul Dirac]], stretching between two Dirac [[magnetic monopole]]s with opposite magnetic charges, or from one magnetic monopole out to infinity.  The [[gauge potential]] cannot be defined on the Dirac string, but it is defined everywhere else. The Dirac string acts as the [[solenoid]] in the [[Aharonov-Bohm effect]], and the requirement that the position of the Dirac string should not be observable implies the Dirac quantization rule: the product of a magnetic charge and an electric charge must always be an integer multiple of <math>2\pi</math>. 


The Dirac string is the only way to incorporate magnetic monopoles into [[Maxwell's equations]], since the magnetic flux running along the interior of the string maintains their validity.  If Maxwell equations are modified to allow magnetic charges at the fundamental level then the magnetic monopoles are Dirac monopoles no longer and do not require attached Dirac strings.


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The quantization forced by the Dirac string can be understood in terms of the [[cohomology]] of the [[fibre bundle]] representing the gauge fields over the base manifold of space-time. The magnetic charges of a gauge field theory can be understood to be the group generators of the cohomology group <math>H_1(M)</math> for the fiber bundle ''M''. The cohomology arises from the idea of classifying all possible gauge [[field strength]]s <math>F=dA</math>, which are manifestly [[exact form]]s, modulo all possible gauge transformations, given that the field strength ''F'' must be a [[closed and exact differential forms|closed form]]: <math>dF=0</math>. Here, ''A'' is the [[vector potential]] and ''d'' represents the gauge-[[covariant derivative]], and ''F'' the field strength or [[curvature form]] on the fiber bundle. Informally, one might say that the Dirac string carries away the "excess curvature" that would otherwise prevent ''F'' from being a closed form, as one has that <math>dF=0</math> everywhere except at the location of the monopole.
 
==References==
* {{cite journal | first = P.A.M. | last = Dirac | authorlink = Paul Dirac | url = http://rspa.royalsocietypublishing.org/content/133/821/60.full.pdf+html | title = Quantized Singularities in the Electromagnetic Field | journal = [[Proceedings of the Royal Society A]] | volume = 133 | issue = 821 | date = September 1931 | pages = 60–72 | doi = 10.1098/rspa.1931.0130 }}
 
{{DEFAULTSORT:Dirac String}}
[[Category:Quantum field theory]]

Latest revision as of 16:56, 7 January 2015


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