高自旋引力如何超越自旋二障碍：不通过定理与通过例子
How higher-spin gravity surpasses the spin two barrier: no-go theorems versus yes-go examples
摘要：
针对非专家，我们解释了普通引力的高自旋扩展的关键机制。我们首先概述了各种不去定理的低能量散射的无质量粒子在平坦的时空。在这样做的时候，我们穿着的S-矩阵和拉格朗日方法之间的字典，展示其相对的优点和缺点，之后，我们高光潜在的非平凡的无质量动力学的环孔。然后，我们审查积极的是去的结果，非阿贝尔三次高导数顶点在不断弯曲的背景。最后，我们概述了如何更高的自旋对称性可以调和的等效原理的存在下，一个宇宙学常数导致的弗拉德金-瓦西里耶夫顶点和瓦西里耶夫的高自旋引力与其双微扰展开（在字段和衍生物的数量）。
英文摘要：
Aiming at non-experts, we explain the key mechanisms of higher-spin extensions of ordinary gravity. We first overview various no-go theorems for low-energy scattering of massless particles in flat spacetime. In doing so we dress a dictionary between the S-matrix and the Lagrangian approaches, exhibiting their relative advantages and weaknesses, after which we high-light potential loop-holes for non-trivial massless dynamics. We then review positive yes-go results for non-abelian cubic higher-derivative vertices in constantly curved backgrounds. Finally we outline how higher-spin symmetry can be reconciled with the equivalence principle in the presence of a cosmological constant leading to the Fradkin--Vasiliev vertices and Vasiliev's higher-spin gravity with its double perturbative expansion (in terms of numbers of fields and derivatives).
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