Cosmological Perturbation Theory
  A short pedagogical overview of cosmological perturbation theory, following
the lectures given during the brazilian school of cosmology held in August
2012. Topics treated are:
  I. The background
  II. SVT decomposition and the gauge issue.
  III. The example of the tensor modes.
  IV. Density fluctuations, transfer function and power spectrum.
  V. Initial condition theory: quantum vacuum fluctuations.
