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{{Unreferenced|date=December 2009}}
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In [[theoretical physics]], one often analyzes theories with [[supersymmetry]] in which '''D-terms''' play an important role. In four dimensions, the minimal N=1 supersymmetry may be written using a [[superspace]]. This superspace involves four extra fermionic coordinates <math>\theta^1,\theta^2,\bar\theta^1,\bar\theta^2</math>, transforming as a two-component [[spinor]] and its conjugate.
 
Every superfield, i.e. a field that depends on all coordinates of the superspace, may be expanded with respect to the new fermionic coordinates. The generic kind of superfields, typically a [[vector superfield]], indeed depend on all these coordinates. The last term in the corresponding expansion, namely <math>D \theta^1\theta^2\bar\theta^1\bar\theta^2</math>, is called the D-term.
 
Manifestly supersymmetric [[Lagrangian]]s may also be written as [[integral]]s over the whole superspace. Some special terms, such as the [[superpotential]], may be written as integrals over <math>\theta</math>s only, which are known as [[F-term]]s, and should be contrasted with the present D-terms.
 
==See also==
* [[F-term]]
* [[Supersymmetric gauge theory]]
 
{{DEFAULTSORT:D-Term}}
[[Category:Supersymmetry]]
 
 
 
 
{{Particle-stub}}

Latest revision as of 18:37, 10 December 2014

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