Signatures of Primordial Gravitational Waves on the Large-Scale
  Structure of the Universe
  We study the generation and evolution of second-order energy-density
perturbations arising from primordial gravitational waves. Such tensor-induced
scalar modes approximately evolve as standard linear matter perturbations and
may leave observable signatures in the Large-Scale Structure of the Universe.
We study the imprint on the matter power spectrum of some primordial models
which predict a large gravitational-wave signal at high frequencies. This novel
mechanism in principle allows us to constrain or detect primordial
gravitational waves by looking at specific features in the matter or galaxy
power spectrum and allows us to probe them on a range of scales which are
unexplored so far.
