B-ball Baryogenesis and the Baryon to Dark Matter Ratio
Abstract
We demonstrate that B-ball decay in the MSSM can naturally solve the puzzle of why the densities of baryons and dark matter in the Universe are similar. This requires that the B-balls survive thermalization and decay below the freeze-out temperature of the neutralino LSP, typically 1-10GeV. It is shown that this can happen if the baryon asymmetry originates from a squark condensate along the d=6 ucdcdc D-flat direction of the MSSM scalar potential. For this to work the reheating temperature after inflation must be no greater than 103-105 GeV.
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