Graviton production in noninflationary cosmology

@article{Durrer2009GravitonPI,
  title={Graviton production in noninflationary cosmology},
  author={Ruth Durrer and Massimiliano Rinaldi},
  journal={Physical Review D},
  year={2009},
  volume={79},
  pages={063507}
}
We discuss the creation of massless particles in a Universe, which transits from a radiation-dominated era to any other expansion law. We calculate in detail the generation of gravitons during the transition to a matter-dominated era. We show that the resulting gravitons generated in the standard radiation/matter transition are negligible. We use our result to constrain one or more previous matter-dominated era, or any other expansion law, which may have taken place in the early Universe. We… 

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