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We calculate the baryon asymmetry created by the decay of a pseudoNambu-Goldstone boson whose interactions violate baryon number conservation.Our results are in disagreement with previous results in the originalspontaneous baryogenesis models for the asymmetry produced by the decay of anoscillating scalar field with B number violating derivative couplings; we findthat the net baryon number density is proportional to $\th_i^3$, where $\th_i$is the amplitude of the PNGB-field in natural inflation at the onset ofreheating. We also discuss our disagreement with the interpretation of$\dot\theta$ as an effective chemical potential for baryon number inspontaneous baryogenesis models. While our calculation of the asymmetry iscarried out in the context of natural inflation our approach is generally validfor baryogenesis models using decaying classical fields. In the Appendices, weinclude a complete derivation of the number density of particles produced bythe decay of a classical scalar field; this number density is proportional tothe integral over momenta of the one pair production amplitude.Comment: 22 pages, TeX, no figures. Submitted to Physical Review

Baryogenesis during reheating in natural inflation and comments on spontaneous baryogenesis