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arXiv 1004.3744hep-th
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物种和字符串

Species and Strings

Gia Dvali, Cesar Gomez

摘要:

基于半经典黑洞的著名性质,我们证明了弱耦合弦论可以看作是N = 1/g_s^2粒子种类的理论。这个陈述是弦理论对以下事实的实现:在任何相容的D维引力理论中,基本尺度不是普朗克长度l_D,而是物种尺度L_N = N^1/(D-2)l_D。利用这一事实,我们导出了当S > N时,任何相容引力理论中半经典黑洞熵的界,当应用于弦论时,为前一关系提供了额外的证据。计算结果还表明,贝肯斯坦-霍金熵可以看作是纠缠熵,而不需要遇到任何物种之谜。我们证明了物种的计数扩展到M-理论极限。物种尺度的作用现在由11维的普朗克长度扮演,超过这个长度,距离的分辨率在引力上是不可能的。结论是,弦论是一个物种理论,当物种变得强耦合和解耦时,它被一个纯粹的引力理论所取代。

英文摘要:

Based on well-known properties of semi-classical black holes, we show that weakly-coupled string theory can be viewed as a theory of N = 1/g_s^2 particle species. This statement is a string theoretic realization of the fact that the fundamental scale in any consistent D-dimensional theory of gravity is not the Planck length l_D, but rather the species scale L_N = N^1/(D-2) l_D. Using this fact, we derive the bound on semi-classical black hole entropy in any consistent theory of gravity as S > N, which when applied to string theory provides additional evidence for the former relation. This counting also shows that the Bekenstein-Hawking entropy can be viewed as the entanglement entropy, without encountering any puzzle of species. We demonstrate that the counting of species extends to the M-theory limit. The role of the species scale is now played by the eleven-dimensional Planck length, beyond which resolution of distances is gravitationally-impossible. The conclusion is, that string theory is a theory of species and gets replaced by a pure gravitational theory in the limit when species become strongly coupled and decouple.

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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