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arXiv 2005.07212hep-th
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三维动量空间自旋关联函数和高阶自旋方程

Momentum space spinning correlators and higher spin equations in three dimensions

Sachin Jain, Renjan Rajan John, Vinay Malvimat

摘要:

本文在动量空间中显式计算了三维自由玻色子和自由费米子理论中涉及标量和自旋算符的三点和四点关联函数。我们还计算了自由玻色理论中标量算子的五点函数。我们讨论的技术是更有效的比通常的PV减少评估一个循环积分。我们的技术可以很容易地推广到复杂的自旋算子的动量空间关联函数和更高的点函数。三维费米子理论中标量算符$\barψψ$在宇称下是奇的。为了说明这一点,我们开发了一个奇偶校验奇的基础上,这是有用的关联函数,涉及自旋运营商和奇数的$\barψψ$运营商。我们进一步研究了动量空间中的高自旋(HS)方程,这些方程本质上是代数的,因此比位置空间中的方程简单。我们用它们来解决涉及自旋算子的三点函数,而无需调用共形不变性。然而,在四点函数的水平上,求解HS方程需要来自共形不变性的额外约束,我们只能验证我们的显式结果解决了HS方程。

英文摘要:

In this article, we explicitly compute in momentum space the three and four-point correlation functions involving scalar and spinning operators in the free bosonic and the free fermionic theory in three dimensions. We also evaluate the five-point function of the scalar operator in the free bosonic theory. We discuss techniques which are more efficient than the usual PV reduction to evaluate one loop integrals. Our techniques can be easily generalised to momentum space correlators of complicated spinning operators and to higher point functions. The three dimensional fermionic theory has the interesting feature that the scalar operator $\barψψ$ is odd under parity. To account for this, we develop a parity odd basis which is useful to write correlation functions involving spinning operators and an odd number of $\barψψ$ operators. We further study higher spin (HS) equations in momentum space which are algebraic in nature and hence simpler than their position space counterparts. We use them to solve for three-point functions involving spinning operators without invoking conformal invariance. However, at the level of four-point functions, solving the HS equation requires additional constraints that come from conformal invariance and we could only verify that our explicit results solve the HS equation.

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