  The simplest model of inflation is based around an inflaton field that starts
in a coherent false vacuum state with a positive cosmological constant, rolls
slowly to the true vacuum and relaxes to it via reheating. We examine whether
the scale of the transition from coherence to chaoticity can be examined via
the Hanbury-Brown and Twiss (HBT) effect, in parallel with analogous problems
of heavy ion physics (the ``pion laser'' and the thermalizing glasma).
  We develop an ansatz which contains a definition of ''chaoticity'' which
parallels that of the usual setups where HBT is used.
  However, we also discuss the differences between the inflationary setup and
more mainstream uses of HBT and conclude that these are more significant than
the similarities, making the use of the developed methodology uncertain.
