Gravitational waves from peaks

@article{Luca2019GravitationalWF,
  title={Gravitational waves from peaks},
  author={Valerio De Luca and Vincent Desjacques and Gabriele Franciolini and Antonio Walter Riotto},
  journal={Journal of Cosmology and Astroparticle Physics},
  year={2019},
  volume={2019},
  pages={059 - 059}
}
We discuss a novel mechanism to generate gravitational waves in the early universe. A standard way to produce primordial black holes is to enhance at small-scales the overdensity perturbations generated during inflation. The latter, upon horizon re-entry, collapse into black holes. They must be sizeable enough and are therefore associated to rare peaks. There are however less sizeable and much less rare overdensity peaks which do not end up forming primordial black holes and have a non… 

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