arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1209.3010hep-th
收藏

刚性的重要性:离散扭转下T6/Z2xZ6 '的D6-Brane模型建立

The Importance of Being Rigid: D6-Brane Model Building on T6/Z2xZ6' with Discrete Torsion

Gabriele Honecker, Martin Ripka, Wieland Staessens

摘要:

考虑了T_6/Z_2xZ_6 '上IIA型定向折叠上刚性D_6-膜离散挠的建模问题。通过证明不同晶格取向之间的新对称性,粒子物理模型的系统搜索显著减少。对合适的无物质刚性D 6-膜在伴随表示和对称表示中进行了分类,并根据离散Wilson线和位移参数对定向折叠不变D 6-膜上的SO(2N)和USp(2N)规范因子进行了区分.对奇异物质不存在的限制禁止了局部MSSM和左右对称模型的全局完备化,而全局定义的超对称Pati-Salam模型被发现,对于后者,只有一个粒子世代具有微扰Yukawa耦合.质量为温和的外来物质和阿贝尔对称性的作用进行了简要讨论。最后但并非最不重要的是,它表明,对于所有三个两个环面体积的数量级相同,规范耦合统一在一个循环可以实现,而高度各向异性的选择,在TeV范围内的低弦标度是兼容的规范和引力耦合的观测强度。

英文摘要:

Model building with rigid D6-branes on the Type IIA orientifold on T6/Z2xZ6' with discrete torsion is considered. The systematic search for models of particle physics is significantly reduced by proving new symmetries among different lattice orientations. Suitable rigid D6-branes without matter in adjoint and symmetric representations are classified, and SO(2N) and USp(2N) gauge factors on orientifold invariant D6-branes are distinguished in terms of their discrete Wilson line and displacement parameters. Constraints on the non-existence of exotic matter prohibit global completions of local MSSM and left-right symmetric models, while globally defined supersymmetric Pati-Salam models are found. For the latter, only one particle generation possesses perturbative Yukawa couplings. Masses for the mild amount of exotic matter and the role of Abelian symmetries are briefly discussed. Last but not least, it is shown that for all three two-torus volumes of about the same order of magnitude, gauge coupling unification at one-loop can be achieved, while for highly unisotropic choices a low string scale in the TeV range is compatible with the observed strengths of gauge and gravitational couplings.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑