  To confront the transplanckian problem encountered in the backward
extrapolation of the cosmological expansion of the momenta of the modes of
quantum field theory, it is proposed that there is a reservoir, depository of
transplanckian degrees of freedom. These are solicited by the cisplanckian
modes so as to keep their density fixed and the total energy density of vacuum
at a minimum.
  The mechanism is due to mode - reservoir interaction, whereupon virtual
quantum processes give rise to an effective mode-mode attraction. A BCS
condensate results. It has a massless and massy collective excitation, the
latter identified with the inflaton. For an effective non dimensional
mode-reservoir coupling constant, g approx 0.3, the order of magnitude of its
mass is what is required to account for cosmological fluctuations i.e. O(10^-6
-> 10^-5)m_Planck.
