Primordial Gravitational Waves with LISA
  Primordial Gravitational Waves are the next target of modern cosmology. They
represent a window on the early Universe and the only probe of the physics and
microphysics of the inflationary period. When the production of GWs happens in
scenarios richer than the standard single-field slow-roll, the GW signal
becomes potentially detectable also on scales smaller than the Cosmic Microwave
Background. LISA will be extremely complementary to CMB experiments to extract
information about primordial inflationary models and in particular to probe
phases of the inflationary period for which we have very poor knowledges.
