arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.04658hep-thmath-phmath.MP
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度量代数体与二重场论中的Dirac生成算子

Metric algebroid and Dirac generating operator in Double Field Theory

Ursula Carow-Watamura, Kohei Miura, Satoshi Watamura, Taro Yano

摘要:

给出了基于度量代数体的双场论的一种形式。我们得到了Bianchi恒等式的协变完备化,即挠率和改进的广义曲率下的pre-Bianchi恒等式,以及包含Reynon贡献的pre-Bianchi恒等式.由Dirac生成算子导出的括号公式被应用于度量代数体。我们提出了一个推广的Lichnerowicz公式,并证明了它与pre-Bianchi恒等式是等价的。在这种情况下,该子项作为一种歧义包含在发散中。投影的广义Lichnerowicz公式给出了DFT作用量的一个新公式。自旋丛上广义李导数的封闭性作为相容性条件得到了Bianchi恒等式。本文讨论了广义超引力方程的一个关系。

英文摘要:

We give a formulation of Double Field Theory (DFT) based on a metric algebroid. We derive a covariant completion of the Bianchi identities, i.e. the pre-Bianchi identity in torsion and an improved generalized curvature, and the pre-Bianchi identity including the dilaton contribution. The derived bracket formulation by the Dirac generating operator is applied to the metric algebroid. We propose a generalized Lichnerowicz formula and show that it is equivalent to the pre-Bianchi identities. The dilaton in this setting is included as an ambiguity in the divergence. The projected generalized Lichnerowicz formula gives a new formulation of the DFT action. The closure of the generalized Lie derivative on the spin bundle yields the Bianchi identities as a consistency condition. A relation to the generalized supergravity equations (GSE) is discussed.

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