The production of baryons by black holes small enough to evaporate X, X bosons is compared with the Weinberg–Wilczek model for baryon production which appeals only to the free decay of X-bosons in the SU(5), grand unified gauge theory. A detailed model of the baryon generation is given in an isotropically expanding Universe containing a fraction of its energy density in black holes small enough to evaporate X, X bosons by the Hawking effect. Even if the X boson mass, Mx and the gauge coupling constant, α, are such as to prevent the Weinberg decay generating an asymmetry (Mx ≲ 10−2αMp) black holes are still able to do so. If both the Weinberg and Hawking processes are able to generate baryons then so long as the fraction of the Universe in black holes with Hawking temperature Mx exceeds |~10⁻²α3/2| and |M_ X>10⁻⁴ M_ p| the black hole baryon production always dominates. It is explained why the present entropy per baryon may parametrize ‘chaotic’ expansion dynamics close to the Planck time.
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John D. Barrow (1980) studied this question.