Affleck-Dine mechanism with negative thermal logarithmic potential

Abstract

We investigate whether the Affleck-Dine (AD) mechanism works when the contribution of the two-loop thermal correction to the potential is negative in the gauge-mediated supersymmetry breaking models. The AD field is trapped far away from the origin by the negative thermal correction for a long time until the temperature of the universe becomes low enough. The most striking feature is that the Hubble parameter becomes much smaller than the mass scale of the radial component of the AD field, during the trap. Then, the amplitude of the AD field decreases so slowly that the baryon number is not fixed even after the onset of radial oscillation. The resultant baryon asymmetry crucially depends on whether the Hubble parameter, $H$, is larger than the mass scale of the phase component of the AD field, $M_{\theta }$, at the beginning of oscillation. If $H<M_{\theta }$ holds, the formation of Q balls plays an essential role to determine the baryon number, which is found to be washed out due to the nonlinear dynamics of Q-ball formation. On the other hand, if $H>M_{\theta }$ holds, it is found that the dynamics of Q-ball formation does not affect the baryon asymmetry, and that it is possible to generate the right amount of the baryon asymmetry.

arXiv comment18 pages, RevTeX4, 9 postscript figures included, final version to appear in Phys.Rev.D

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• Asymmetric Dark Matter from Spontaneous Cogenesis in the Supersymmetric Standard Model
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• Q-ball Instability due to U(1) Breaking
• Affleck-Dine baryogenesis and gravitino dark matter
• Gravitational Waves from Q-ball Formation
• Formation of the Q ball in the thermal logarithmic potential and its properties
• Affleck-Dine baryogenesis with modulated reheating
• Towards the robustness of Affleck-Dine mechanism