Nonlocal gravity with worldline inversion symmetry
Nonlocal gravity with worldline inversion symmetry
复制标题
具有世界线反演对称性的非局域引力
DOI：
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发表时间：
2019
影响因子：
5.4
通讯作者：
A. Mazumdar
中科院分区：
文献类型：
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作者：
S. Abel;L. Buoninfante;A. Mazumdar
我们构造了一个二次曲率引力理论，它的引力子传播子在闵可夫斯基背景下尊重弦理论中模不变性的粒子近似-这种对称性自动产生了一个相应的非定域引力理论，其作用量包含无穷阶微分算子。因此，尽管它是一个高阶导数理论，但它是无幽灵的，除了爱因斯坦广义相对论中的无质量自旋2引力子之外没有自由度。通过在线性化制度的工作，我们表明，困扰（本地）爱因斯坦的理论的点状奇点被涂抹。
We construct a quadratic curvature theory of gravity whose graviton propagator around the Minkowski background respects wordline inversion symmetry, the particle approximation to modular invariance in string theory. This symmetry automatically yields a corresponding gravitational theory that is nonlocal, with the action containing infinite order differential operators. As a consequence, despite being a higher order derivative theory, it is ghost-free and has no degrees of freedom besides the massless spin-2 graviton of Einstein’s general relativity. By working in the linearised regime we show that the point-like singularities that afflict the (local) Einstein’s theory are smeared out.