  Assuming gauge/gravity correspondence we study reheating of the Universe
using its holographic dual. Inflaton decay and thermalisation of the decay
products correspond to collapse of a spherical shell and formation of a
blackhole in the dual anti-de Sitter (AdS) spacetime. The reheating temperature
is computed as the Hawking temperature of the developed blackhole probed by a
dynamical boundary, and is determined by the inflaton energy density and the
AdS radius, with corrections from the dynamics of the shell collapse. For given
initial energy density of the inflaton field the holographic model gives
significantly lower reheating temperature than the instant reheating scenario,
while it is shown to be safely within phenomenological bounds.
