  A new scenario of baryogenesis via the ratchet mechanism is proposed based on
an analogy to the forced pendulum. The oscillation of the inflaton field during
the reheating epoch after inflation plays the role of the driving force, while
the phase $\theta$ of a scalar baryon field (a complex scalar field with baryon
number) plays the role of the angle of the pendulum. When the inflaton is
coupled to the scalar baryon, the behavior of the phase $\theta$ can be
analogous to that of the angle of the forced pendulum. If the oscillation of
the driving force is adjusted to the pendulum's motion, a directed rotation of
the pendulum is obtained with a non-vanishing value of $\dot{\theta}$, which
models successful baryogenesis since $\dot{\theta}$ is proportional to the
baryon number density. Similar ratchet models which lead to directed motion
have been used in the study of molecular motors in biology. There, the driving
force is supplied by chemical reactions, while in our scenario this role is
played by the inflaton during the reheating epoch. Keywords: Baryogenesis;
Reheating; Inflaton; Ratchet Model; Forced Rotating Pendulum
