Exact results in supersymmetric gauge theories

Exact results in supersymmetric gauge theories
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超对称规范理论的精确结果

DOI:
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发表时间:
2014
期刊:
影响因子:
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通讯作者:
Saulius Valatka
Saulius Valatka
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作者:
Saulius Valatka

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在这篇论文中,我们讨论了超对称规范理论,重点讨论了利用可积性方法所得到的精确结果。在本文的较大部分中,我们研究了平面极限下N=4的超杨-米尔斯理论,一个反复出现的主题是Konishi反常维度,它大致类似于量子色动力学中的质子质量。众所周知,N=4的超对称杨-米尔斯理论在平面极限中是可积的,这开辟了人们可以采用的丰富的技术,以便找到在这个极限中在任何耦合值下有效的结果。我们从微扰理论开始,该理论的可积性首先表现出来。在这里,我们展示了第一个精确的结果,即所谓的斜率函数,它是广义Konishi反常维度的线性小自旋展开系数。然后我们继续到主要使用新的量子谱曲线方法所获得的准确结果,该方法允许人们在耦合的任意值时找到算符的标度维度。作为例子,我们求出了斜率后的小自旋展开中的第二个系数,我们称之为曲率函数。这使我们能够提取关于Konishi操作符的重要信息。可积性方法也适用于其他超对称规范理论,如ABJM,它实际上与N=4的超级Yang-Mills有许多相似之处。我们在论文的最后一章简要回顾了这些平行的发展。
In this thesis we discuss supersymmetric gauge theories, focusing on exact results achieved using methods of integrability. For the larger portion of the thesis we study the N=4 super Yang-Mills theory in the planar limit, a recurring topic being the Konishi anomalous dimension, which is roughly the analogue for the mass of the proton in quantum chromodynamics. The N=4 supersymmetric Yang-Mills theory is known to be integrable in the planar limit, which opens up a wealth of techniques one can employ in order to find results in this limit valid at any value of the coupling. We begin with perturbation theory where the integrability of the theory first manifests itself. Here we showcase the first exact result, the so-called slope function, which is the linear small spin expansion coefficient of the generalized Konishi anomalous dimension. We then move on to exact results mainly achieved using the novel quantum spectral curve approach, the method allowing one to find scaling dimensions of operators at arbitrary values of the coupling. As an example we find the second coefficient in the small spin expansion after the slope, which we call the curvature function. This allows us to extract non-trivial information about the Konishi operator. Methods of integrability are also applicable to other supersymmetric gauge theories such as ABJM, which in fact shares many similarities with N=4 super Yang-Mills. We briefly review these parallel developments in the last chapter of the thesis.
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