2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/175926We 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 $Λ\sim 10^{-3}$ 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.5 two-column pages, RevTex4; two reference added and minor changes made in the text; published in JCAPAstrophysicsHigh Energy Physics - Phenomenologytext