Table 5.

Re-growth time in one, two and three dimensions for the Skellam equation with a Dirac delta initial condition.

spatial dimensions	Tr
One dimension	$(-1/2\rho )W(-\rho u_N^{\prime 2}/u_{\ast }^{2}2\pi D)$
Two dimensions	$(-1/\rho )W(-\rho u_N^{\prime }/u_{\ast }4\pi D)$
Three dimensions	$(-3/2\rho )W((-\rho /6\pi D){(u_N^{\prime }/u_{\ast })}^{2/3})$