  We present a minimal approach to the generation of the baryon ($B$) asymmetry
of the Universe, in which the asymmetry is generated in a complex inflaton
condensate via $B$-violating quadratic inflaton potential terms using the
Affleck-Dine (AD) mechanism. We show that the $B$-violating quadratic mass
terms create an oscillating asymmetry in the complex inflaton condensate at
late times. The final asymmetry transferred to the Standard Model sector at
reheating is naturally reduced to the magnitude of the observed $B$ asymmetry
by the effect of averaging over the $B$ oscillations. This approach to
baryogenesis can easily be realised in a wide range of inflation models. We
also show that AD baryogenesis via inflaton mass terms is free of the tuning of
field dynamics required by the conventional AD mechanism.

High Energy Physics - Phenomenology;Cosmology and Nongalactic Astrophysics;High Energy Astrophysical Phenomena;High Energy Physics - Theory