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arXiv 0811.1758hep-th
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超弦混合形式下的黑洞配分函数

Black Hole Partition Function using Hybrid Formalism of Superstrings

B. Chandrasekhar

摘要:

利用欧氏吸引子几何AdS_2 x S^2 x CY_3上的IIA型超弦配分函数Z_IIA,计算了相应黑洞的修正椭圆亏格Z_BH.陪集超流形PSU(1,1)上共形不变西格玛模型超弦的混合形式|2)/U(1)xU(1),并结合Calabi-Yau和手征玻色子计算了Z_IIA。西格玛模型对AdS_2 x S^2的作用被明确地写在U(1)xU(1)不变变量中。将AdS_2xS^2xCY_3的N=2生成元扩大并嵌入到N=4拓扑代数中.世界片超共形不变性,然后用来构建一个幂零BRST运营商,在对比的Kappa对称性分析所使用的Beasely等。等人在HEP-TH/0608021中描述。西格玛模型的行动明确表明,在此BRST运营商关闭。局部化的参数,然后使用变形的世界片路径积分,加上一个BRST的精确项,其中,贡献只出现在中心的AdS_2和,北极和南极的S^2。这导致OSV结果Z_BH = Z_IIA = |Z_top| ^2,其中|Z_top| ^2是拓扑弦配分函数的平方。

英文摘要:

The type IIA superstring partition function Z_IIA on the euclidean attractor geometry AdS_2 x S^2 x CY_3, computes the modified elliptic genus Z_BH of the associated black hole. The hybrid formalism of superstrings defined as a conformally invariant sigma model on the coset supermanifold PSU(1,1|2)/U(1)xU(1), together with Calabi-Yau and chiral boson CFTs, is used to calculate Z_IIA. The sigma model action on AdS_2 x S^2 is explicitly written in U(1)xU(1) invariant variables. The N=2 generators of AdS_2 x S^2 x CY_3 are enlarged and embedded in an N=4 topological algebra. The world sheet superconformal invariance is then used to construct a nilpotent BRST operator, in contrast to the kappa symmetry analysis used by Beasely et. al. in hep-th/0608021. The sigma model action is explicitly shown to be closed under this BRST operator. Localization arguments are then used to deform the world sheet path integral with the addition of a BRST exact term, where, contributions arise only from the center of AdS_2 and, the north and south poles of S^2. This leads to the OSV result Z_BH = Z_IIA = |Z_top|^2, where |Z_top|^2 is the square of the topological string partition function.

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