what classical PDEs have analytical expressions for soliton-like shape solutions but motionless?
for example, KdV has analytical expressions of the kind (sech^2(x-vt)), but all of them are propagative, and introduce a drift to cancel its motion is not an option.
I am looking for a classical PDE with a straightforward and well known unimodal (or one bump-like) analytical solutions, but motionless.