Lorentz-violating brane worlds and cosmological perturbations

  title={Lorentz-violating brane worlds and cosmological perturbations},
  author={M. Libanov and V. Rubakov},
  journal={Physical Review D},
We consider an inflating brane-world setup in which 4-dimensional Lorentz-invariance is violated at high 3-momentum scale PLV ≫ H, where H is the inflationary Hubble parameter. We study massless scalar field in this background as a model for cosmological perturbations. Towards the end of inflation, the spectrum has both the standard, 4-dimensional part due to a brane-localized mode, and exotic, bulk induced contribution. The suppression of the latter is power-law only, (H/PLV ) α , provided… Expand