Scanning the Fluxless G_2 Landscape

Bobkov, Konstantin ; /SLAC

关键词: COSMOLOGICAL CONSTANT;    INSTANTONS;    NUCLEATION;    PHYSICS;    SYMMETRY BREAKING Theory-HEP;    OTHER;   

DOI  :  10.2172/958575
RP-ID  :  SLAC-PUB-13681
PID  :  OSTI ID: 958575
Others  :  Other: arXiv:0906.5359
Others  :  TRN: US0904753

学科分类：物理（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

We show that there exists an exponentially large discretuum of vacua in G{sub 2}-compactifications of M-theory without flux. In M-theory-inspired G{sub 2}-MSSM, quantities relevant for particle physics remain virtually insensitive to large variations of the vacuum energy across the landscape. The purely non-perturbative vacua form a special subset of a more general class of vacua containing fractional Chern-Simons contributions. The cosmological constant can be dynamically neutralized via a chain of transitions interpolated by fractional gauge instantons describing spontaneous nucleation of M2-brane domain walls. Each transition is generically accompanied by a gauge symmetry breaking in some sector of the theory. In particular, the visible sector GUT symmetry breaking can likewise be triggered by a spontaneous nucleation of an M2-brane.