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arXiv 1605.07510hep-thgr-qcmath.DG
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3D重力的6D解释

6D Interpretation of 3D Gravity

Yannick Herfray, Kirill Krasnov, Carlos Scarinci

摘要:

我们表明,3D重力,在其纯连接制定,承认一个自然的6D解释。在三维基上的主丛的全空间中,联络的三维场方程等价于Chern-Simons 3-形式的6D Hitchin方程。把这个结构反过来,人们就可以解释为什么3D引力的纯连接公式存在。更一般地说,我们将3D引力解释为6D希钦理论的降维。为此,我们证明了在主SU(2)丛的全空间中的任何SU(2)不变的闭3-形式都可以通过一个连接与基上的2-形式场一起参数化。6D希钦理论的降维则产生了耦合到拓扑2-形式场的3D引力。

英文摘要:

We show that 3D gravity, in its pure connection formulation, admits a natural 6D interpretation. The 3D field equations for the connection are equivalent to 6D Hitchin equations for the Chern-Simons 3-form in the total space of the principal bundle over the 3-dimensional base. Turning this construction around one gets an explanation of why the pure connection formulation of 3D gravity exists. More generally, we interpret 3D gravity as the dimensional reduction of the 6D Hitchin theory. To this end, we show that any SU(2) invariant closed 3-form in the total space of the principal SU(2) bundle can be parametrised by a connection together with a 2-form field on the base. The dimensional reduction of the 6D Hitchin theory then gives rise to 3D gravity coupled to a topological 2-form field.

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