Article

# Cosmological vacuum selection, metastable susy breaking and moduli

Fortschritte der Physik (Impact Factor: 0.98). 08/2011; 59(11‐12):1103 - 1107. DOI:10.1002/prop.201100078

ABSTRACT We discuss the thermal evolution of the spurion and messenger fields of ordinary gauge mediation models taking into account the Standard Model degrees of freedom. It is shown that for thermalized messengers the metastable susy breaking vacuum becomes thermally selected provided that the susy breaking sector is sufficiently weakly coupled to messengers or to any observable field. It is shown that large values of untwisted moduli help stabilize the spurion at the right value. We introduce the critical temper ature related to the thermal stability of the moduli sector.

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##### Article: R-Symmetry and Gravitino Abundance
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ABSTRACT: Supersymmetry breaking sectors generically have an approximate global U(1) $R$-symmetry. Thermal effects tend to restore the $R$-symmetry in the reheated early universe. We revisit the gravitino generation from the thermal plasma and we argue that an $R$-symmetric phase suppresses the gaugino masses and thereby the production of the helicity $\pm 1/2$ gravitino component. For reasonable values of the hidden sector parameters the gravitino can account for the dark matter of the universe with a relic abundance characterized by a remarkable insensitivity to the reheating temperature.
Physical review D: Particles and fields 10/2011;