Current algebra

Current algebra is a mathematical framework in quantum field theory where the fields form a Lie algebra under their commutation relations.

For instance, in a non-Abelian Yang–Mills symmetry, where ρ is the charge density,

$[\rho^a(\vec{x}),\rho^b(\vec{y})]=if^{ab}_c\delta(\vec{x}-\vec{y})\rho^c(\vec{x})$

where f are the structure constants of the Lie algebra. If space is a one dimensional circle, there may exist central extensions.

See also

• affine Lie algebra
• Virasoro algebra

References

• Sam B. Treiman; Roman Jackiw; David J. Gross, Lectures on current algebra and its applications. Princeton Series in Physics. Princeton University Press, Princeton, N.J., 1972. x+362 pp.

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