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北美退伍军人节(Veterans Day),12 日无更新
arXiv 2007.05746hep-thhep-phmath-phmath.MP
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粒子II的Lorentz和置换不变量

Lorentz and permutation invariants of particles II

Ben Gripaios, Ward Haddadin, C. G. Lester

摘要:

Weyl的两个定理告诉我们,在$n$粒子的动量中,Lorentz-(和宇称-)不变多项式的代数是由点积产生的,而当$n$超过时空维度$d$时产生的冗余是由点积的$n \times n$矩阵的$(d+1)$ -未成年人产生的。在这里,我们使用的不变代数的科恩-麦考利结构,以提供一个更直接的表征方面的Hironaka分解。这种方法的好处之一是,它可以直接推广到置换群作用于粒子的情况,例如当一些粒子是相同的时候。在第一个非平凡的情况下,$n=d+1$,我们给出了一个齐次系统的参数,是有效的任意置换对称的作用,并作出猜想的情况下,没有置换对称的完全Hironaka分解。附录给出了计算$d \leq 4$的相关希尔伯特级数的公式。

英文摘要:

Two theorems of Weyl tell us that the algebra of Lorentz- (and parity-) invariant polynomials in the momenta of $n$ particles are generated by the dot products and that the redundancies which arise when $n$ exceeds the spacetime dimension $d$ are generated by the $(d+1)$-minors of the $n \times n$ matrix of dot products. Here, we use the Cohen-Macaulay structure of the invariant algebra to provide a more direct characterisation in terms of a Hironaka decomposition. Among the benefits of this approach is that it can be generalized straightforwardly to cases where a permutation group acts on the particles, such as when some of the particles are identical. In the first non-trivial case, $n=d+1$, we give a homogeneous system of parameters that is valid for the action of an arbitrary permutation symmetry and make a conjecture for the full Hironaka decomposition in the case without permutation symmetry. An appendix gives formulæ for the computation of the relevant Hilbert series for $d \leq 4$.

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