arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2106.09054hep-th
收藏

三线性拉格朗日量的双拷贝

Double copy for Lagrangians at trilinear order

M. Beneke, P. Hager, A. F. Sanfilippo

摘要:

我们提出了一个新的双拷贝处方的规范场在拉格朗日水平,并将其应用到原来的双拷贝,耦合到物质和软定理。本文将轻锥规范中的Yang-Mills拉格朗日量直接映射到轻锥规范中的$\mathcal{N}=0$超引力拉格朗日量,得到三线性阶的结果,并证明了在三线性阶下所得结果与树级的Einstein引力是明显等价的。应用双拷贝处方耦合到物质的例子是标量和费米QCD,最后软共线有效QCD拉格朗日。后者的映射产生了一个有效的描述,一个充满活力的狄拉克费米子耦合到引力子,卡尔布-拉蒙,和费米子场,从费米子引力软和次软定理遵循。

英文摘要:

We present a novel double-copy prescription for gauge fields at the Lagrangian level and apply it to the original double copy, couplings to matter and the soft theorem. The Yang-Mills Lagrangian in light-cone gauge is mapped directly to the $\mathcal{N}=0$ supergravity Lagrangian in light-cone gauge to trilinear order, and we show that the obtained result is manifestly equivalent to Einstein gravity at tree level up to this order. The application of the double-copy prescription to couplings to matter is exemplified by scalar and fermionic QCD and finally the soft-collinear effective QCD Lagrangian. The mapping of the latter yields an effective description of an energetic Dirac fermion coupled to the graviton, Kalb-Ramond, and dilaton fields, from which the fermionic gravitational soft and next-to-soft theorems follow.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑