  Dynamical wormholes in higher dimensions which admit flat emergent universe
(EU) model is presented. The EU model is free from initial singularity with
other observed features of the universe. The basic assumption of EU model was
that the present universe emerged out from a static Einstein universe. EU model
originates from a dynamical wormhole, its throat is the seed of Einstein Static
universe. A class of cosmological solutions in a higher dimensional flat
universe is presented. A new shape function for closed universe is determined.
The non-linear equation of state (EoS) corresponds to three types of cosmic
fluids. The EoS parameters determine the cosmic fluids. The space-time
dimensions determines the rate of change of a particular fluid that varies with
the scale factor of a dynamically evolving universe with non-interacting
fluids. Considering interaction at time $t > t_0$, among the three types of
fluids it is possible to describe the observed universe satisfactorily. In a
higher dimensional universe it is found that near the throat null energy
condition (NEC) is violated, but away from the throat NEC is found to obey
admitting the observed universe for a flat case. Another interesting aspect of
the EU model is that it permits late accelerating phase. However, in asymptotic
closed or open universe, flat emergent universe can be accommodated with NEC
which is obeyed right from the throat to the present epoch. The tension at the
throat of the wormhole is estimated which is found to depend on the initial
size of the Einstein static universe and dimensions of the universe. It is
interesting to note that NEC is not violated to accommodate dynamical wormholes
for closed or open universe. Although exotic matter is required at the throat
for the flat universe, no exotic matter is required for closed or open universe
which encompass the emergent universe.

General Relativity and Quantum Cosmology