The Berry phase in inflationary cosmology
  We derive an analogue of the Berry phase associated with inflationary
cosmological perturbations of quantum mechanical origin by obtaining the
corresponding wavefunction. We have further shown that cosmological Berry phase
can be completely envisioned through the observable parameters, viz. spectral
indices. Finally, physical significance of this phase is discussed from the
point of view of theoretical and observational aspects with some possible
consequences of this quantity in inflationary cosmology.
