  We discuss the discrete light-cone quantization (DLCQ) of a scalar field
theory on the maximally supersymmetric pp-wave background in ten dimensions. It
has been shown that the DLCQ can be carried out in the same way as in the
two-dimensional Minkowski spacetime. Then, the vacuum energy is computed by
evaluating the vacuum expectation value of the light-cone Hamiltonian. The
results are consistent with the effective potential obtained in our previous
work [hep-th/0402028].
