Massive Dirac operators in R^4 have L^1 to L^infty decay t^{-2} at regular thresholds, and t^{-1} plus a (log t)^{-1} finite-rank correction when threshold resonances or eigenvalues are present.
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Dispersive estimates for Dirac Operators in dimension four with obstructions at threshold energies
Massive Dirac operators in R^4 have L^1 to L^infty decay t^{-2} at regular thresholds, and t^{-1} plus a (log t)^{-1} finite-rank correction when threshold resonances or eigenvalues are present.