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arXiv 1602.01334hep-thgr-qc
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N=2,D=4规范超引力下的辛不变流方程

Symplectically invariant flow equations for N=2, D=4 gauged supergravity with hypermultiplets

Dietmar Klemm, Nicolò Petri, Marco Rabbiosi

摘要:

我们认为N=2超引力在四维空间中,耦合到一个任意数量的矢量和hypermultiplets,其中阿贝尔等距的四元数超标量目标流形进行测量。使用静态和球或双曲对称的Anonymous的领域,一个一维的有效作用量推导出其变化产生的所有运动方程。通过施加一种狄拉克电荷量子化条件,人们可以用超势来表示完全标量势,并将作用量写成平方和。这导致一阶流动方程,这意味着二阶运动方程。一阶流原来是由汉密尔顿-雅可比形式主义中的汉密尔顿特征函数驱动的,并且包含标量的超势。然后,我们还包括磁测量和推广的流动方程的辛协变形式。此外,通过以适当的方式旋转电荷,获得了对应于作用的不同平方的非BPS一阶方程的替代集合。最后,我们利用我们的结果导出了极端黑洞的近视界几何的吸引子方程。

英文摘要:

We consider N=2 supergravity in four dimensions, coupled to an arbitrary number of vector- and hypermultiplets, where abelian isometries of the quaternionic hyperscalar target manifold are gauged. Using a static and spherically or hyperbolically symmetric ansatz for the fields, a one-dimensional effective action is derived whose variation yields all the equations of motion. By imposing a sort of Dirac charge quantization condition, one can express the complete scalar potential in terms of a superpotential and write the action as a sum of squares. This leads to first-order flow equations, that imply the second-order equations of motion. The first-order flow turns out to be driven by Hamilton's characteristic function in the Hamilton-Jacobi formalism, and contains among other contributions the superpotential of the scalars. We then include also magnetic gaugings and generalize the flow equations to a symplectically covariant form. Moreover, by rotating the charges in an appropriate way, an alternative set of non-BPS first-order equations is obtained that corresponds to a different squaring of the action. Finally, we use our results to derive the attractor equations for near-horizon geometries of extremal black holes.

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