Theoretical and Phenomenological Study of G2 Compactification of M Theory.

[摘要] This thesis focuses on the study of G2 compactification of M theory. With the as-sumption that the low energy effective theory is the minimal supersymmetric standardmodel (MSSM), these kinds of compactifications produce an interesting model calledG2-MSSM with distinctive particle spectrum. An approximate discrete symmetry on theG2 manifold combined with symmetry breaking Wilson lines provide a solution to thedoublet-triplet splitting problem and generate a suppressed mu term. This small mu termis consistent with electroweak symmetry breaking and the so called ;;little hierarchy”problem is alleviated in G2-MSSM. The phenomenology of G2 -MSSM is also studied.The lightest supersymmetric particle (LSP), which is almost always a wino, is stable be-cause of the R-parity of the theory, and has the right relic abundance when non-thermallyproduced by the moduli decay. And due to its large annihilation cross section, it mightprovide a partial explanation of the signals observed by indirect detection experiments.Because of the suppressed mu term, the mass of the lightest Higgs particle in G2-MSSMis about 125 GeV when the scalars are O(50 TeV). The gauginos are much lighter thanthe scalars in G2-MSSM. The gluino and chargino have interesting collider signals at theLHC.

[发布机构] University of Michigan

[效力级别] Phenomenology

[关键词] G2 Compactification;Phenomenology;Physics;Science;Physics