  By including spectator fields into the Boltzmann equations for Leptogenesis,
we show that partially equilibrated spectator interactions can have a
significant impact on the freeze-out value of the asymmetry in the strong
washout regime. The final asymmetry is typically increased, since partially
equilibrated spectators "hide" a part of the asymmetry from washout. We study
examples with leptonic and non-leptonic spectator processes, assuming thermal
initial conditions, and find up to 50% enhanced asymmetries compared to the
limit of fully equilibrated spectators. Together with a comprehensive overview
of the equilibration temperatures for various Standard Model processes, the
numerical results indicate the ranges when the limiting cases of either fully
equilibrated or negligible spectator fields are applicable and when they are
not. Our findings also indicate an increased sensitivity to initial conditions
and finite density corrections even in the strong washout regime.
