Multi-field inflation from holography
  We initiate the study of multi-field inflation using holography. Bulk light
scalar fields correspond to nearly marginal operators in the boundary theory
and the dual quantum field theory is a deformation of a CFT by such operators.
We compute the power spectra of adiabatic and entropy perturbations in a simple
model and find that the adiabatic curvature perturbation is not conserved in
the presence of entropy perturbations but becomes conserved when the entropy
perturbations are set to zero or the model is effectively a single scalar
model, in agreement with expectations from cosmological perturbation theory.
