  We consider the d-dimensional diffusion equation for a field phi(x,t) with
random initial condition, and observe that, when appropriately scaled, phi(0,t)
is Gaussian and Markovian in the limit d->0. This leads via the Majumdar-Sire
perturbation theory to a small-d expansion for the persistence exponent
theta(d). We find theta(d) = d/4 - 0.12065...d^{3/2} + ...
