Messenger inflation in gauge mediation and superWIMP dark matter
arXiv:2103.11256 · doi:10.1103/PhysRevD.104.083539
Abstract
We discuss phenomenological viability of a novel inflationary model in the minimal gauge mediated supersymmetry breaking scenario. In this model, cosmic inflation is realized in the flat direction along the messenger supermultiplets and a natural dark matter candidate is the gravitino from the out-of-equilibrium decay of the bino-like neutralino at late times, which is called the superWIMP scenario. The produced gravitino is warmish and can have a large free-streaming length; thus the cusp anomaly in the small scale structure formation may be mitigated. We show that the requirement of the Standard Model Higgs boson mass to be GeV gives a relation between the spectrum of the cosmic microwave background and the messenger mass . We find, for the e-folding number , the Planck 2018 constraints (TT, TE, EE+lowE+lensing+BK15+BAO, 68% confidence level) give GeV. The gravitino dark matter mass is GeV and the supersymmetry breaking scale is found to be in the range GeV. Future CMB observation is expected to give tighter constraints on these parameters.
arXiv comment9 pages, 3 figures. Version to be published
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