We reconsider the possibility that the observed baryon asymmetry was generated by the evaporation of primordial black holes that dominated the early universe. We present a simple derivation showing that the baryon asymmetry is insensitive to the initial black hole density and the cosmological model but is sensitive to the temperature-dependence of the CP and baryon-violating (or lepton-violatin...

We examine effects on primordial nucleosynthesis from a truly random spatial distribution in the baryon-to-photon ratio (η). We generate stochastic fluctuation spectra characterized by different spectral indices and root-mean-square fluctuation amplitudes. For the first time we explicitly calculate the effects of baryon diffusion on the nucleosynthesis yields of such stochastic fluctuations. We...

We compute the baryonic mass function, ψS (Mb), of disk galaxies using the first luminosity functions and baryonic mass-to-light ratios reliable for this goal. On scales from 108M⊙ to 10 11M⊙ such function is featureless, ψ S ∝ M −1/2 b . Outside this mass range ψ S is a strong inverse function of Mb. The contributions to the baryon density ΩSb from objects of different mass indicate that spira...

We discuss two cosmological issues in a generic gauge-mediated supersymmetry~SUSY-!breaking model, namely, the Universe’s baryon asymmetry and the gravitino dark-matter density. We show that both problems can be simultaneously solved if there exist extra matter multiplets of a SUSY-invariant mass of the order of the ‘‘m term,’’ as suggested in several realistic SUSY grand-unified theories. We p...

We calculate the shape of the ππ and ¯ K N invariant mass distributions in the b → J/ψ π and b → J/ψ ¯ K N decays that are dominated by the (1405) resonance. The weak interaction part is the same for both processes and the hadronization into the different meson–baryon channels in the final state is given by symmetry arguments. The most important feature is the implementation of the meson–baryon...