扫描无通量$G_2$环境
Scanning the Fluxless $G_2$ Landscape
摘要：
我们证明了在无通量的M-理论的$G_2$ -紧化中存在指数大的真空离散。在受到M理论启发的$G_2$ -MSSM中，粒子物理学的相关量实际上对整个景观中真空能量的大变化不敏感。纯粹的非微扰真空形成一个特殊的子集更一般的一类真空包含分数陈-西蒙斯的贡献。宇宙学常数可以通过描述M2膜畴壁自发成核的分数规范瞬子内插的跃迁链动态地中和。每一个跃迁一般都伴随着理论中某个部分的规范对称性破缺。特别地，可见扇区GUT对称破缺同样可以由M2膜的自发成核触发。
英文摘要：
We show that there exists an exponentially large discretuum of vacua in $G_2$-compactifications of M-theory without flux. In M-theory-inspired $G_2$-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.
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