PIC collision times from velocity autocorrelation decay match Okuda-Birdsall-Langdon theory in 1D-3D; physical thermalization timescales are often unreachable in 3D when macroparticles resolve the Debye length.
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Numerical thermalization in $n$-D particle-in-cell simulations
PIC collision times from velocity autocorrelation decay match Okuda-Birdsall-Langdon theory in 1D-3D; physical thermalization timescales are often unreachable in 3D when macroparticles resolve the Debye length.