Massive and massless spin-2 scattering and asymptotic superluminality
Massive and massless spin-2 scattering and asymptotic superluminality
复制标题
大量和无质量的自旋 2 散射和渐进超光速
DOI：
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发表时间：
2017
影响因子：
5.4
通讯作者：
Rachel A Rosen
中科院分区：
文献类型：
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作者：
James Bonifacio;Kurt Hinterbichler;A. Joyce;Rachel A Rosen
通过要求在动能散射中不存在时间推进，我们约束了质量自旋2粒子与无质量自旋2粒子耦合的理论。这是S矩阵的考虑，它导致了对理论中存在的三次顶点的与模型无关的约束。在两个自旋为2的粒子的可能的立方顶点中，亚亮度的要求留下了爱因斯坦-希尔伯特类型的立方顶点的特殊线性组合。要么立方顶点必须出现在这个组合中，要么新物理必须以与质量自旋2场的质量参数相同的比例进入，模为一些标准的警告。这些结论表明，存在一个与光速下散射相一致的单参数无重影双测引力理论。当两个粒子耦合到附加物质时，亚光性会对物质耦合施加额外的约束。此外，我们还通过在无重影双测理论中考虑冲击波背景的经典散射来重现这些约束。
We constrain theories of a massive spin-2 particle coupled to a massless spin-2 particle by demanding the absence of a time advance in eikonal scattering. This is an S-matrix consideration that leads to model-independent constraints on the cubic vertices present in the theory. Of the possible cubic vertices for the two spin-2 particles, the requirement of subluminality leaves a particular linear combination of cubic vertices of the Einstein-Hilbert type. Either the cubic vertices must appear in this combination or new physics must enter at a scale parametrically the same as the mass of the massive spin-2 field, modulo some standard caveats. These conclusions imply that there is a one-parameter family of ghost-free bimetric theories of gravity that are consistent with subluminal scattering. When both particles couple to additional matter, subluminality places additional constraints on the matter couplings. We additionally reproduce these constraints by considering classical scattering off of a shockwave background in the ghost-free bimetric theory.
影响因子：
5
作者：
Xián O. Camanho;Gustavo Lucena Gómez;Rakibur Rahman
通讯作者：
Rakibur Rahman