2014

Lorentz Invariance in Chiral Kinetic Theory

Chen, Jing-Yuan, Son, Dam T., Stephanov, Mikhail A. et al.

Understand

We show that Lorentz invariance is realized nontrivially in the classical action of a massless spin-$\frac12$ particle with definite helicity.

  • We find that the ordinary Lorentz transformation is modified by a shift orthogonal to the boost vector and the particle momentum.
  • The shift ensures angular momentum conservation in particle collisions and implies a nonlocality of the collision term in the Lorentz-invariant kinetic theory due to side jumps.
  • We show that 2/3 of the chiral-vortical effect for a uniformly rotating particle distribution can be attributed to the magnetic moment coupling required by the Lorentz invariance.

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