The Quantum State of Inflationary Perturbations
  This article reviews the properties of the quantum state of inflationary perturbations. After a brief description of the inflationary background, the wavefunction of the Mukhanov-Sasaki variable is calculated and shown to be that of a strongly squeezed state. The corresponding Wigner function and density matrix, which are convenient tools to characterize the properties of a quantum state, are also evaluated. Finally, the issue of definite outcomes for inflation is discussed. 
Jerome Martin (Institut d'Astrophysique de Paris)
hep-th astro-ph.CO hep-ph quant-ph