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arXiv 1405.7271hep-th
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球配分函数与Zamolodchikov度量

Sphere Partition Functions and the Zamolodchikov Metric

Efrat Gerchkovitz, Jaume Gomis, Zohar Komargodski

摘要:

研究了d维共形场论(CFTs)球配分函数的有限部分作为精确边缘耦合的函数。在奇数维中,这个量是物理的,与精确的边际耦合无关。在偶数维中,这个对象通常依赖于正则化方案,因此是非物理的。然而,在额外的对称性的存在下,偶维CFTs的配分函数可以变成物理的。对于二维N=(2,2)超对称CFTs,连续配分函数存在,并计算了手征和扭曲手征超共形流形上的Kahler势.利用球面上的沃德恒等式给出了这个结果的一个新的初等证明。在相应的N=(2,2)超引力理论中,Kahler变换的不确定性与一个局部项相对应。在四维N=2超对称CFTs的情况下,我们得到了一个类似的新结果:S^4配分函数计算超共形流形上的Kahler势。最后,我们证明了四维N=1超对称性和二维N=(1,1)超对称性不足以使相应的球配分函数成为精确的边缘参数的定义良好的函数.

英文摘要:

We study the finite part of the sphere partition function of d-dimensional Conformal Field Theories (CFTs) as a function of exactly marginal couplings. In odd dimensions, this quantity is physical and independent of the exactly marginal couplings. In even dimensions, this object is generally regularization scheme dependent and thus unphysical. However, in the presence of additional symmetries, the partition function of even-dimensional CFTs can become physical. For two-dimensional N=(2,2) supersymmetric CFTs, the continuum partition function exists and computes the Kahler potential on the chiral and twisted chiral superconformal manifolds. We provide a new elementary proof of this result using Ward identities on the sphere. The Kahler transformation ambiguity is identified with a local term in the corresponding N=(2,2) supergravity theory. We derive an analogous, new, result in the case of four-dimensional N=2 supersymmetric CFTs: the S^4 partition function computes the Kahler potential on the superconformal manifold. Finally, we show that N=1 supersymmetry in four dimensions and N=(1,1) supersymmetry in two dimensions are not sufficient to make the corresponding sphere partition functions well-defined functions of the exactly marginal parameters.

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