  Motivated by kinetically constrained interacting particle systems (KCM), we
consider a reversible coalescing and branching simple exclusion process on a
general finite graph $G=(V,E)$ dual to the biased voter model on $G$. Our main
goal are tight bounds on its logarithmic Sobolev constant and relaxation time,
with particular focus on the delicate slightly supercritical regime in which
the equilibrium density of particles tends to zero as $|V|\rightarrow \infty$.
Our results allow us to recover very directly and improve to $\ell^p$-mixing,
$p\ge 2$, and to more general graphs, the mixing time results of Pillai and
Smith for the Fredrickson-Andersen one spin facilitated (FA-$1$f) KCM on the
discrete $d$-dimensional torus. In view of applications to the more complex
FA-$j$f KCM, $j>1$, we also extend part of the analysis to an analogous process
with a more general product state space.
