  We present a particle physics quintessence model which agrees well with
existing cosmological data, including the position of the acoustic peaks. This
model has an inverse power law potential (IPL) with $n=18/7\sim 2.57$ and it
gives $\weff=-0.75$, an acoustic scale $l_A=307$ and a density contrast
$\s8=0.95$.
  Models with $n>1$ have been said to be disfavored by the analysis of the
acoustic peaks. However, the results are not correct. The main reason is that
the tracker approximation has been used in deriving the IPL constrains and for
$n<5$ the scalar field has not reached its tracker value by present day.
  The model can be derived from particle physics, using Affleck-Dine-Seiberg
"ADS" superpotential, for a non-abelian gauge group with $N_c=8, N_f=1$. The
advantage of having $N_f=1$ is that there is only one degree of freedom below
the condensation scale given by the condensate (quintessence)
  $\phi^2=<Q\tilde Q>$ field. The condensation scale is at $1 GeV$ a very
interesting scale since it connects the quintessence "Q" with the standard
model "SM" scale. The similarity in energy scales between $Q$ and $SM$ scale
gives an "explanation" to the coincidence problem. The fact that only recently
the universe is accelerating is a natural consequence of the Q scale and the
evolution of $\phi$.
