K. Narayan

Lifshitz spacetimes from AdS null and cosmological solutions

We describe solutions of 10-dimensional supergravity comprising null deformations of AdS5 × S5 with a scalar field, which have z = 2 Lifshitz symmetries. The bulk Lifshitz geometry in 3 + 1-dimensions arises by dimensional reduction of these solutions. The dual field theory in this case is a deformation of the

On Lifshitz scaling and hyperscaling violation in string theory

\mathcal{N} = 4

Cosmologies with Null Singularities and their Gauge Theory Duals

super Yang-Mills theory. We discuss the holographic 2-point function of operators dual to bulk scalars. We further describe time-dependent (cosmological) solutions which have anisotropic Lifshitz scaling symmetries. We also discuss deformations of AdS × X in 11-dimensional supergravity, which are somewhat similar to the solutions above. In some cases here, we expect the field theory duals to be deformations of the Chern-Simons theories on M2-branes stacked at singularities.

Gauge Theories with Time Dependent Couplings and their Cosmological Duals

We explore string/M-theory constructions of holographic theories with Lifshitz scaling exponent

Gauge theory duals of cosmological backgrounds and their energy momentum tensors

z

Brane inflation, solitons and cosmological solutions: I

and hyperscaling violation exponent

AdS plane waves and entanglement entropy

\theta

Lifshitz-like systems and AdS null deformations

, finding a range of

Schwarzschild black hole with global monopole charge

z,\theta

Hot little string correlators: a view from supergravity

-values. Some of these arise as effective metrics from dimensional reduction of certain kinds of null deformations of