Baryon isocurvature perturbation in the Affleck-Dine baryogenesis mechanism

We propose a primeval baryon isocurvature model in the context of the Affle ck-Dine (AD) baryogenesis mechanism. Quantum fluctuations of the AD field d uring inflation produce fluctuations in the baryon number. We obtain a mode l which gives both the appropriate baryon to entropy ratio of the order 10( -11) and the Gaussian baryon isocurvature perturbation of the order 10(-3) at the break of the spectrum 1 Mpc with the steep spectrum n = - 1.5 on lar ge scales >1 Mpc. [S0031-9007(99)08760-8].