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arXiv 1201.3063hep-th
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五维超引力中SL(2,R)-对偶的“翻转”

"Flip" of SL(2,R)-duality in five-dimensional supergravity

Shun'ya Mizoguchi, Shinya Tomizawa

摘要:

将五维最小超引力的玻色子扇区降维为四维洛仑兹时空,得到了一个无质量的轴子和一个耦合到引力和两个U(1)规范场的介子理论,降维后的运动方程具有SL(2,R)/SO(2)对偶不变性。在我们以前的工作中,利用对偶不变性,我们制定了五维最小超引力的解决方案生成技术。本文通过选择类时Killing向量,考虑降维到四维欧氏空间,其中场方程具有SL(2,R)/SO(1,1)不变性.在类时的情况下,我们开发了一种新的对偶变换技术,而在类空的情况下,我们已经做了,在以前的工作。作为一个例子,将其应用于Rasheed解,得到了五维极小超引力下旋转Kaluza-Klein黑洞解.一般来说,与类空情形相反,所得到的降维解包含了所谓的NUT参数,因此从四维的观点来看,这样的时空不是渐近平坦的。然而,在某些特殊情况下,它可以描述一般的Kaluza-Klein黑洞.

英文摘要:

The dimensional reduction of the bosonic sector of five-dimensional minimal supergravity to a Lorentzian four-dimensional spacetime leads to a theory with a massless axion and a dilaton coupled to gravity and two U(1) gauge fields and the dimensionally reduced equations of motion have SL(2,R)/SO(2)-duality invariance. In our previous work, utilizing the duality invariance, we formulated solution-generation techniques within five-dimensional minimal supergravity. In this work, by choosing a timelike Killing vector, we consider dimensional reduction to a four-dimensional Euclidean space, in which the field equations have SL(2,R)/SO(1,1) invariance. In the timelike case, we develop a new duality transformation technique, while in the spacelike case we have done that in the previous work. As an example, by applying it to the Rasheed solutions, we obtain rotating Kaluza-Klein black hole solutions in five-dimensional minimal supergravity. In general, in contrast to the spacelike case, the resulting dimensionally reduced solution includes the so-called NUT parameter and therefore from a four-dimensional point of view, such a spacetime is not asymptotically flat. However, it is shown that in some special cases, it can describe ordinary Kaluza-Klein black holes.

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