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arXiv 1508.01124hep-th
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6维超引力中膜定域通量的微调

Fine-tuning with Brane-Localized Flux in 6D Supergravity

Florian Niedermann, Robert Schneider

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16 pages
发表信息：
JHEP 1602 (2016) 025
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摘要：

在文献中，有人声称宇宙学常数问题可以在具有两个大的（微米大小的）超对称额外维度的膜世界模型中解决。该机制依赖于两个基本成分：第一，宇宙学常数仅将紧凑的块状几何形状弯曲成橄榄球形状，而4D曲率保持平坦。第二，一个膜本地化的通量项，以规避温伯格的微调参数，否则进入这里通过后门通过通量量子化条件。在本文中，我们表明，后者的机制不工作的方式，它被设计：唯一的本地化通量耦合，保证一个平坦的膜上几何是一个保持规模不变性的散装理论。因此，温伯格的论点适用，再次进行微调是必要的。唯一剩下的机会窗口在于尺度不变性破坏膜耦合，这是可以避免的调谐。相应的4D曲率是否可以保持在控制之下，并与观测值一致，将在我们的配套文件[arXiv：1512.03800]中回答。

英文摘要：

There are claims in the literature that the cosmological constant problem could be solved in a braneworld model with two large (micron-sized) supersymmetric extra dimensions. The mechanism relies on two basic ingredients: First, the cosmological constant only curves the compact bulk geometry into a rugby shape while the 4D curvature stays flat. Second, a brane-localized flux term is introduced in order to circumvent Weinberg's fine-tuning argument, which otherwise enters here through a backdoor via the flux quantization condition. In this paper, we show that the latter mechanism does not work in the way it was designed: The only localized flux coupling that guarantees a flat on-brane geometry is one which preserves the scale invariance of the bulk theory. Consequently, Weinberg's argument applies, making a fine-tuning necessary again. The only remaining window of opportunity lies within scale invariance breaking brane couplings, for which the tuning could be avoided. Whether the corresponding 4D curvature could be kept under control and in agreement with the observed value will be answered in our companion paper [arXiv:1512.03800].

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。

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