  This paper studies type IIA string theory in AdS4 x CP3 in both the BMN limit
and the Maldacena-Swanson or near-flat-space limit. We derive the simpler
Lagrangian for the latter limit by taking a large worldsheet boost of the BMN
theory. We then calculate one-loop corrections to the correlators of the
various fields using both theories. In all cases the near-flat-space results
agree with a limit of the BMN results, providing evidence for the quantum
consistency of this truncation. The corrections can also be compared to an
expansion of the exact dispersion relation, known from integrability apart from
one interpolating function h(lambda). Here we see agreement with the results of
McLoughlin, Roiban & Tseytlin, and we observe that it does not appear to be
possible to fully implement the cutoff suggested by Gromov & Mikhaylov,
although for some terms we can do so. In both the near-flat-space and BMN
calculations there are some extra terms in the mass shifts which break
supersymmetry. These terms are extremely sensitive to the cutoff used, and can
perhaps be seen as a consequence of using dimensional regularisation.
