  We present a new simple self-consistent field theory of the polarizable
flexible polymer chain under the external constant electric field with account
for the many-body electrostatic dipole correlations. We show the effect of
electrostatic dipole correlations on the electric field-induced globule-coil
transition. We demonstrate that only when the polymer chain is in the coil
conformation, the electrostatic dipole correlations of monomers can be
considered as pairwise. However, when the polymer chain is in collapsed state,
the dipole correlations have to be considered at the many-body level.
