  Within the framework of a model universe with time variable space dimension
(TVSD), known as decrumpling or TVSD model, we show the present value of the
deceleration parameter is negative implying that the universe is accelerating
today. Our study is based on a flat universe with the equation of state
parameter to be $\omega(z=0) \approx -1$ today. More clearly, decrumpling model
tells us the universe is accelerating today due to the cosmological constant
which is the simplest candidate for the dark energy.
