arXiv 0901.21112009-01hep-phhep-th

多粒子理论中引力诱导耦合的结果

Consequences of Gravity-Induced Couplings in Theories with Many Particle Species

Rakibur Rahman

备注：: 7 pages; feynman diagrams added, typos corrected; to appear in Physics Letters B.
发表信息：: Phys.Lett.B688:71-74,2010
DOI：: 10.1016/j.physletb.2010.03.034

摘要：

在具有许多标准模型副本的理论中，虚拟黑洞交换可能产生有效的高维算子，这些算子可以在截止尺度以下被视为种间非引力相互作用的基本顶点。我们考虑一种粒子的费米子通过磁矩耦合到另一种粒子的光子的顶点，并研究它产生的量子修正。特别是，我们发现通过费米子环产生的不同种类的光子之间的动力学混合。规范动力学项的对角化则使费米子在其他粒子的电磁作用下被毫荷电。我们探讨了一些现象学的后果，这样的影响，考虑可能的可观察到的签名在对撞机实验和约束的相互作用强度。导出的边界与微观黑洞耦合的非民主性质一致。

英文摘要：

In theories with many copies of the Standard Model virtual black hole exchange may produce effective higher dimensional operators that can be treated below the cutoff scale as fundamental vertices of interspecies non-gravitational interaction. We consider the vertex that couples fermions of one species through magnetic moment to photons of other species, and study the quantum corrections it generates. In particular, we find kinetic mixing between photons of different species produced via fermion loops. Diagonalization of gauge kinetic terms then renders the fermions millicharged under other species' electromagnetism. We explore some phenomenological consequences of such effects by considering possible observable signatures in collider experiments and constraining the interaction strength. The derived bounds are in agreement with non-democratic nature of micro black hole coupling.

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