A kinetic term contains derivatives of a field and determines its free propagation. Its quadratic differential operator becomes the inverse quantum field theory propagator.
A gauge-covariant kinetic term replaces ordinary derivatives by covariant derivatives. Expanding it generates interactions between the matter field and one or more gauge fields, including contact vertices with two gauge bosons.

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  1. Lagrangian density
  2. Lagrangian (field theory)
  3. Classical field theory
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Kinetic term by Wikipedia Bot 1
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The kinetic term refers to the part of an equation or expression that represents the kinetic energy of a system. In physics, kinetic energy is the energy that an object possesses due to its motion.
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