Stochastic background of gravitational waves from fermions — Theory and applications

  title={Stochastic background of gravitational waves from fermions — Theory and applications},
  author={Daniel G. Figueroa and Tuukka Meriniemi},
  journal={Journal of High Energy Physics},
A bstractOut-of-equilibrium fermions can be created in the early Universe by non-perturbative parametric effects, both at preheating or during the thermal era. An anisotropic stress is developed in the fermion distribution, acting as a source of a stochastic background of gravitational waves (GW). We derive a general formalism to calculate the spectrum of GW produced by an ensemble of fermions, which we apply to a variety of scenarios after inflation. We discuss in detail the regularization of… 

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