两膜之间的物质交换：通过E3瞬子实现带电费米子混合的局域IIB型D3-D7-D3构造
Matter Swapping between Two Branes: A Local Type IIB D3-D7-D3 Realization of Charged-Fermion Mixing via E3 Instantons
- Université Marie et Louis Pasteur, CNRS, Institut UTINAM (UMR 6213), Équipe de Physique Théorique（玛丽和路易·巴斯德大学，法国国家科学研究中心，UTINAM研究所）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本文构造局域IIB型D3-D7-D3/E3弦论实现，通过E3瞬子非微扰生成被微扰禁止的膜间费米子混合，重现双叶算符的赝标量结构，并为紧致化模型提供路线图。
AI中文摘要：
膜世界之间费米子混合的有效红外双叶描述已在多种不同实现中出现，并导致可检验的物质交换效应，从而推动低能搜索和宇宙学应用。同一低能费米子算符的反复出现促使我们思考该结构是否也能源自D膜机制。我们构造了一个局域IIB型D3$_+$-D7-D3$_-$/E3实现，其中直接的膜间混合在微扰论中被禁止，但通过合适的E3瞬子扇区非微扰地产生。所得低能相互作用重现了双叶费米子算符的特征赝标量结构及其标量伴随项，而D7 Wilson输运提供了所需的规范不变相对联络。因此，该构造提供了同一算符结构的局域弦论实现，但需满足所述的瞬子及零模条件。该分析进一步为迈向紧致唯象实现提供了具体的模型构建路线图：紧致化必须实现两个费米子扇区的电磁隔离，并支持一个足够轻的非均匀D7规范模式，以介导长程相对相互作用。在这样的完整紧致化中，混合参数$g$原则上可由微观弦论数据计算，并可直接与低能约束进行检验。
英文摘要：
Effective infrared two-sheeted descriptions of fermion mixing between braneworlds have emerged in several distinct realizations and lead to testable matter-swapping effects, motivating low-energy searches and cosmological applications. The recurrence of the same low-energy fermion operator motivates asking whether this structure can also arise from a D-brane mechanism. We construct a local Type IIB D3$_+$-D7-D3$_-$/E3 realization in which direct interbrane mixing is perturbatively forbidden but generated non-perturbatively by a suitable E3 instanton sector. The resulting low-energy interaction reproduces the characteristic pseudoscalar structure of the two-sheeted fermion operator, together with its scalar companion, while D7 Wilson transport provides the required gauge-invariant relative connection. The construction therefore provides a local string realization of the same operator structure, subject to the stated instanton and zero-mode conditions. The analysis further provides a concrete model-building roadmap toward a compact phenomenological realization: the compactification must achieve electromagnetic sequestering of the two fermion sectors and support a sufficiently light non-uniform D7 gauge mode capable of mediating a long-range relative interaction. In such a complete compactification, the mixing parameter $g$ would in principle become computable from microscopic string data and directly testable against low-energy constraints.
