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arXiv 1107.2480hep-thgr-qc
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临界和非临界Einstein-Weyl超引力

Critical and Non-Critical Einstein-Weyl Supergravity

H. Lu, C. N. Pope, E. Sezgin, L. Wulff

摘要:

我们构造了N=1的超对称的一些最近提出的理论的临界引力,共形引力,和扩展的临界引力在四维空间。总作用量由三个独立的离壳超对称作用量之和组成,其中包含爱因斯坦引力、宇宙学项和外尔张量的平方。对于这些项的系数的一般选择,围绕AdS_4背景产生的理论的激发描述了来自度规的大质量自旋2和无质量自旋2模式;来自理论中的矢量场的大质量自旋1模式;以及来自引力子的无质量和大质量自旋3/2模式(具有两个不相等的质量)。这些多重态组合成一个无质量和一个有质量的N=1自旋2多重态。在临界超引力中,系数被调整,使得大质量多重态中的自旋2模式变得无质量。在临界引力的超对称扩展中,系数的选择使得有质量模位于最低能量E_0的“窗口”中,这样,通过在无穷远处施加适当的边界条件,可以截断这些幽灵场,从而只留下正范数无质量的超引力模。

英文摘要:

We construct N=1 supersymmetrisations of some recently-proposed theories of critical gravity, conformal gravity, and extensions of critical gravity in four dimensions. The total action consists of the sum of three separately off-shell supersymmetric actions containing Einstein gravity, a cosmological term and the square of the Weyl tensor. For generic choices of the coefficients for these terms, the excitations of the resulting theory around an AdS_4 background describe massive spin-2 and massless spin-2 modes coming from the metric; massive spin-1 modes coming from a vector field in the theory; and massless and massive spin-3/2 modes (with two unequal masses) coming from the gravitino. These assemble into a massless and a massive N=1 spin-2 multiplet. In critical supergravity, the coefficients are tuned so that the spin-2 mode in the massive multiplet becomes massless. In the supersymmetrised extensions of critical gravity, the coefficients are chosen so that the massive modes lie in a "window" of lowest energies E_0 such that these ghostlike fields can be truncated by imposing appropriate boundary conditions at infinity, thus leaving just positive-norm massless supergravity modes.

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