Cosmological Perturbations in Inflationary Models with Anisotropic Space-Time Scaling in Lifshitz Background

Understand

Models of inflation in a gravitational background with an anisotropic space-time scaling are studied.

• The background is a higher-dimensional Lifshitz throat with the anisotropy scaling $z\neq 1$.
• After the dimensional reduction, the four-dimensional general covariance is explicitly broken to a three-dimensional spatial diffeomorphism.
• As a result the cosmological perturbation theory in this set up with less symmetries have to be formulated.