Abstract
In gravity mediated models and in particular in models with stronglystabilized moduli, there is a natural hierarchy between gaugino masses, the gravitino mass and moduli masses: m1/2 << m3/2 << mϕ. Given this hierarchy, we show that 1) moduli problems associated with excess entropy production from moduli decay and 2) problems associatedwith moduli/gravitino decays to neutralinos are non-existent. Placed in an inflationary context,we show that the amplitude of moduli oscillations are severely limited by strong stabilization.Moduli oscillations may then never come to dominate the energy density of the Universe.As a consequence, moduli decay to gravitinos and their subsequent decay to neutralinosneed not overpopulate the cold dark matter density.
Highlights
The presence of light weakly-interacting fields in the early universe has problematic consequences in cosmology [1,2,3]
We have considered the cosmological consequences of a strongly stabilized, supersymmetry breaking hidden sector
The Polonyi sector is not responsible for providing the reheating temperature necessary for nucleosynthesis, since its energy density and the entropy released by its decay are subdominant with respect to that of the inflaton field
Summary
The presence of light weakly-interacting fields (moduli) in the early universe has problematic consequences in cosmology [1,2,3]. In [21], the evolution of the strongly stabilized Polonyi sector was studied in the context of a realization of chaotic inflation and the AD mechanism In all of these models the cosmological problems are addressed by generating a hierarchy between the Polonyi and gravitino masses, mZ ≫ m3/2, effectively stabilizing the Polonyi field during inflation. This hierarchy between the gravitino mass and the weak scale is useful in curing some cosmological problems, it is motivated by the large Higgs mass seen at the LHC [22] This hierarchy implies a decay rate for the gravitino which is much larger than in the standard Polonyi model.
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