Signatures of Primordial Gravitational Waves on the Large-Scale Structure of the Universe

Abstract

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, thereby allowing to probe them on a range of scales unexplored so far.

v2. 8 pages, 2 figures. Figure 1 changed. Typos corrected. References added. Minor change of text. Conclusion unchanged. Published in Physical Review Letters

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