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arXiv 2401.08736hep-thhep-ph
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Regge自举:从线性轨迹到非线性轨迹

The Regge bootstrap, from linear to non-linear trajectories

Christopher Eckner, Felipe Figueroa, Piotr Tourkine

AI总结:

针对对偶模型散射振幅数值自举收敛慢的问题,提出基于Mandelstam-Regge极点参数化与超幺正性的线性规划自举方法,在线性和非线性轨迹场景下均验证了有效性。

摘要:

我们提出一种数值线性规划自举方法来构建对偶模型散射振幅。对偶模型描述弦论、大N规范理论等理论中高自旋共振态的树级交换。尽管这类对象结构简单,但由于共振态无穷级数求和收敛缓慢,其数值自举一直颇具挑战。我们的自举方法之所以可行,得益于用Mandelstam-Regge极点对振幅进行高效参数化,以及使用能让交叉对称性发挥约束作用的组合区域。研究过程中,我们发现并猜想Veneziano振幅具有“超幺正性”,并利用该性质将问题保持为线性问题。\n 结果方面,我们首先研究了一类具有线性轨迹的类弦振幅,观察到Veneziano振幅处于一个优选位置——位于坑底,该位置使交叉效应最小化。随后,我们引入一种模拟QCD某些特征的非线性轨迹玩具模型形变,我们的算法同样检测到了清晰的坑结构。这有力证明了我们的自举方法能够生成具有非平凡唯象特征的振幅。

英文摘要:

We present a numerical linear programming bootstrap to construct dual model scattering amplitudes. Dual models describe tree-level exchanges of higher spin resonances in theories like string theory and large $N$ gauge theories. Despite being very simple objects, their numerical bootstrap has proven challenging due to slow convergence of the infinite sums over resonances. Our bootstrap succeeds thanks to an efficient parametrization of the amplitude in terms of Mandelstam-Regge poles and the use of combined regions that make crossing symmetry constraining. Along the way, we discover and conjecture a property of "super-unitarity" of the Veneziano amplitude, which we use to keep a linear problem. As results, we present first the study of a class of string-like amplitudes with linear trajectories, for which we observe that the Veneziano amplitude lies at a preferred location, at the bottom of a pit, which minimizes crossing. Then, we introduce a toy-model deformation to non-linear trajectories, mimicking some features of QCD, for which our algorithm also detects a clear pit. This gives compelling evidence that our bootstrap is able to produce amplitudes that can exhibit non-trivial phenomenological features.

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