B - ball baryogenesis and the baryon to dark matter ratio

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 u^{c}d^{c}d^{c} D-flat direction of the MSSM scalar potential. For this to work the reheating temperature after inflation must be no greater than 10^3-10^5 GeV.

Note:

39 pages, LaTeX, Final version (To be published in Nuc.Phys.B) Report-no: HIP-1998-18/ph

98.80.Pb
11.30.Fs
12.60.Jv
Supersymmetry
Cosmology
Dark matter
supersymmetry
dark matter
baryon: asymmetry
baryon: production

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