发表机构
University of Cambridge（剑桥大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文对微分同胚不变且具有二阶迹场方程的引力理论分类，证明了相关代数构造理论的猜想，并分类了多项式准拓扑引力。
AI 中文摘要
我们对所有微分同胚不变的引力理论进行分类，这些理论的运动方程的迹场方程在导数阶数上为二阶。我们还肯定地证明了一个关于由黎曼张量代数构造且具有二阶迹场方程的理论形式的猜想，并对所有具有二阶迹场方程的多项式准拓扑引力进行了分类。
英文摘要
We classify all diffeomorphism-invariant theories of gravity which possess traced field equations of motion of second order in derivatives. We also prove in the affirmative a conjecture regarding the form of theories constructed algebraically from the Riemann tensor with second-order traced field equations and classify all polynomial quasi-topological gravities with second-order traced field equations.
Comments7 pages; no figures
