  We use the Gu-Huang model for a special case when the universe is seven
dimensional. In the core of extra dimension we place a modified
Gidding-Strominger wormhole. This wormhole is separated by a thin wall from the
extra dimensional space. The wormhole content is assumed to satisfy the
adiabatic gas law. The wormhole pressure penetrates into the extra dimension.
We then solve the Einstein equation assuming that the real universe and the
extra dimension contains only inextendable fluid with negligible local
pressure. We show the physical universe expands because the time dependent
Hubble parameter is positive. Under certain condition the deacceleration
parameter, $q_0$, is also positive. But the most significant outcome of our
investigation is the fact that $q_0$ fluctuates. If we can detect by
observation that the acceleration fluctuates, our model will be an alternative
explanation without the help of dark energy. We could however link dark energy
with work done by wormhole pressure.
