  We present a new scenario for the baryon number violation that may take place
in models with large extra dimensions. Our idea is interesting because
leptogenesis with a low reheating temperature requires an alternative source of
the B+L violation to convert the produced leptons into baryons. If one
considers a model with an intermediate compactification radius, the reheating
temperature may be allowed to become higher than the critical temperature of
the conventional electroweak phase transition. Our mechanism is still important
in this case, because it provides the phase boundary, which is an essential
ingredient of the electroweak baryogenesis.
