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arXiv 1802.06789hep-th
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$AdS_2$中径向算子的泛函行列式

Functional Determinants of Radial Operators in $AdS_2$

Jeremías Aguilera-Damia, Alberto Faraggi, Leopoldo A. Pando Zayas, Vimal Rathee, Guillermo A. Silva

摘要:

研究了二维欧氏$AdS_2$空间中Laplace型和Dirac型算子的函数行列式的ζ函数正则化.更具体地说,我们考虑的比行列式之间的运营商在存在的背景场与圆对称和自由运营商的背景场缺席。通过傅立叶变换的角度依赖性,一个获得了无限数量的一维径向算子,其行列式是很容易计算的。然后小心地处理模式的求和,以保证结果与二维zeta函数形式主义相一致。该方法依赖于一些众所周知的技术来计算使用轮廓积分和从散射理论的Jost函数的建设的功能行列式。我们的工作推广了平坦空间中的一些已知结果。还考虑了共形$AdS_2$几何的扩展。我们提供了两个例子,一个玻色子和一个费米子,借用全息$\frac{1}{4}$ -BPS纬度威尔逊圈的波动谱。

英文摘要:

We study the zeta-function regularization of functional determinants of Laplace and Dirac-type operators in two-dimensional Euclidean $AdS_2$ space. More specifically, we consider the ratio of determinants between an operator in the presence of background fields with circular symmetry and the free operator in which the background fields are absent. By Fourier-transforming the angular dependence, one obtains an infinite number of one-dimensional radial operators, the determinants of which are easy to compute. The summation over modes is then treated with care so as to guarantee that the result coincides with the two-dimensional zeta-function formalism. The method relies on some well-known techniques to compute functional determinants using contour integrals and the construction of the Jost function from scattering theory. Our work generalizes some known results in flat space. The extension to conformal $AdS_2$ geometries is also considered. We provide two examples, one bosonic and one fermionic, borrowed from the spectrum of fluctuations of the holographic $\frac{1}{4}$-BPS latitude Wilson loop.

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