Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-10-14
ECONFC0605151:0020,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
Talk given at the IPM School and Conference on Lepton and Hadron Physics, Tehran, Iran, May 15-20, 2006
Scientific paper
We argue that all necessary ingredients for successful inflation are present in the flat directions of the minimal supersymmetric standard model (MSSM). Out of many gauge invariant combinations of the squarks, sleptons and Higgses, there are two flat directions, ${\bf LLe}$, and ${\bf udd}$, which are promising candidates for the inflaton. The model predicts more than $10^3$ e-foldings with an inflationary scale of $H_{\rm inf} \sim {\cal O}(1-10)$ GeV, provides a tilted spectrum $0.92 \leq n_s \leq 1$ with an amplitude of $\delta_H \sim 10^{-5}$ and a negligible tensor perturbations. It yields a lower bound $\sim 340$ GeV on the sparticle masses which is within the reach of LHC. There is no gravitino or moduli problem in this model.
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