B-ball baryogenesis and the baryon to dark matter ratio Original Research Article

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 1–10 GeV. 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 103−5 GeV.