Anisotropies in the gravitational wave background from preheating.

  title={Anisotropies in the gravitational wave background from preheating.},
  author={L. Bethke and D. Figueroa and A. Rajantie},
  journal={Physical review letters},
  volume={111 1},
We investigate the anisotropies in the gravitational wave (GW) background produced at preheating after inflation. Using lattice field theory simulations of a massless preheating model, we show that the GW amplitude depends sensitively on the value of the decay product field χ coupled to the inflaton φ, with the only requisite that χ is light during inflation. We find a strong anisotropy in the amplitude of the GW background on large angular scales, the details of which strongly depend on the… Expand

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