NATURALNESS OF 3 GENERATIONS IN FREE FERMIONIC Z(2)(N)CIRCLE-TIMES-Z(4) STRING MODELS

被引：94

作者：

FARAGGI, AE ^{[1
]}

NANOPOULOS, DV ^{[1
]}

机构：

[1] HOUSTON ADV RES CTR,ASTROPARTICLE PHYS GRP,THE WOODLANDS,TX 77381

来源：

PHYSICAL REVIEW D | 1993年 / 48卷 / 07期

关键词：

D O I：

10.1103/PhysRevD.48.3288

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We study the construction of free fermionic spin structure models with Z2n x Z4 boundary-condition vectors. We argue that requiring chiral space-time fermions in the massless spectrum and the existence of a well-defined hidden gauge group severely constrain the allowed boundary-condition vectors. We show that the minimal way to obtain these requirements is given by a unique set of Z2(5) boundary-condition vectors. We classify the possible extensions to this basic set. We argue that a result of this fundamental set is that obtaining three generations in this construction is correlated with projecting out all the enhanced gauge symmetries which arise from nonzero vacuum expectation values of background fields. We propose that this correlation and the properties of the fundamental Z2(5) subset suggest that three generations is natural in this construction.

引用

页码：3288 / 3296

页数：9

共 62 条

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