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arXiv 2012.13410hep-th
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O(D,D)和字符串$α'$展开:阻塞

O(D,D) and the string $α'$ expansion: An obstruction

Stanislav Hronek, Linus Wulff

摘要:

双场论(DFT)试图在d-环面上约化之前,使弦论的O(d,d)T-对偶性显现出来。众所周知,超引力可以用O(D,D)协变的方式表述,值得注意的是,这在$α'$中的一阶仍然成立。本文建立了一个系统的分析O(D,D)不变量的方法,在域上逐序工作,并实现了逐序的$α'^3$。在$α'$阶,我们恢复了已知的黎曼平方不变量,而在$α'^2$阶,我们发现没有独立的不变量。这与弦论中的$α'$展开是相容的。然而,在$α'^3$阶,我们证明了同样没有O(D,D)不变量,这与所有弦论都有系数与$ζ(3)$成比例的四次黎曼不变量的事实相矛盾。我们的结论是,DFT和类似的框架不能捕捉完整的$α'$展开在弦论。

英文摘要:

Double Field Theory (DFT) is an attempt to make the O(d,d) T-duality symmetry of string theory manifest, already before reducing on a d-torus. It is known that supergravity can be formulated in an O(D,D) covariant way, and remarkably this remains true to the first order in $α'$. We set up a systematic way to analyze O(D,D) invariants, working order by order in fields, which we carry out up to order $α'^3$. At order $α'$ we recover the known Riemann squared invariant, while at order $α'^2$ we find no independent invariant. This is compatible with the $α'$ expansion in string theory. However, at order $α'^3$ we show that there is again no O(D,D) invariant, in contradiction to the fact that all string theories have a quartic Riemann invariant with coefficient proportional to $ζ(3)$. We conclude that DFT and similar frameworks cannot capture the full $α'$ expansion in string theory.

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