On the anisotropy of the gravitational wave background from massless preheating

  title={On the anisotropy of the gravitational wave background from massless preheating},
  author={Laura Bethke and Daniel Garc{\'i}a Figueroa and Arttu Rajantie},
  journal={Journal of Cosmology and Astroparticle Physics},
When a light scalar field is present during inflation, its value varies on superhorizon scales, modulating the preheating process at the end of inflation. Consequently, the amplitude of the gravitational wave (GW) background produced during preheating is also modulated. The observed energy density of this background appears therefore anisotropic at different angles in the sky. We provide a master formula for the angular power spectrum Cl of the anisotropies in the GW background from preheating… Expand
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