  We present a complete particle physics model that explains three major
problems of modern cosmology: inflation, dark matter and dark energy, and also
gives a mechanism for leptogenesis. The model has a new gauge group $SU(2)_Z$
that grows strong at a scale $\Lambda\sim 10^{-3}$ eV. We focus on the
inflationary aspects of the model. Inflation occurs with a Coleman-Weinberg
potential at a low scale, down to $\sim 6\times 10^5\gev$, being compatible
with observational data.
