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北美退伍军人节(Veterans Day),12 日无更新
arXiv 2007.12667hep-th
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正界与无质量自旋2极点

Positivity Bounds and the Massless Spin-2 Pole

Lasma Alberte, Claudia de Rham, Sumer Jaitly, Andrew J. Tolley

摘要:

在有效场论中,无质量自旋2场的存在导致散射振幅中的$t$通道极点,从而排除了标准正性边界的应用。尽管如此,最近的论点的基础上紧到三维表明,正界可以应用于$t$通道极点减去幅度。如果正确的话,这将对紫外物理学和弱引力猜想产生深远的影响。在一个简单的重整化场论的范围内耦合到重力,我们发现,应用这些参数将限制低能量的耦合常数的方式,这是不符合他们的实际值。这种矛盾持续存在,使理论发生变形。进一步加强$t$ -通道极点减去正性边界上这样的一般可重整有效理论耦合到重力将意味着新的物理在一个尺度参数小于预期,具有深远的影响。这表明,一般的标准正界是不适用的重力,我们强调了一些问题,冲击制定的三维振幅,同时满足所需的属性的解析性,积极性和交叉对称性。相反,我们推测一个修改后的界限,应该得到满足独立的高能量完成的精确细节。

英文摘要:

The presence of a massless spin-2 field in an effective field theory results in a $t$-channel pole in the scattering amplitudes that precludes the application of standard positivity bounds. Despite this, recent arguments based on compactification to three dimensions have suggested that positivity bounds may be applied to the $t$-channel pole subtracted amplitude. If correct this would have deep implications for UV physics and the Weak Gravity Conjecture. Within the context of a simple renormalizable field theory coupled to gravity we find that applying these arguments would constrain the low-energy coupling constants in a way which is incompatible with their actual values. This contradiction persists on deforming the theory. Further enforcing the $t$-channel pole subtracted positivity bounds on such generic renormalizable effective theories coupled to gravity would imply new physics at a scale parametrically smaller than expected, with far reaching implications. This suggests that generically the standard positivity bounds are inapplicable with gravity and we highlight a number of issues that impinge on the formulation of a three-dimensional amplitude which simultaneously satisfies the required properties of analyticity, positivity and crossing symmetry. We conjecture instead a modified bound that ought to be satisfied independently of the precise details of the high energy completion.

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