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arXiv 2109.06708hep-thgr-qc
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Lorentz不变理论的Carroll压缩

Carroll contractions of Lorentz-invariant theories

Marc Henneaux, Patricio Salgado-Rebolledo

摘要:

我们考虑洛伦兹不变场论的卡罗尔不变极限。我们表明,正如在电磁的情况下,有两个不等价的限制,一个“电”和其他“磁”。每一个都可以从相应的洛伦兹不变量理论中得到,该理论以哈密顿形式写成,通过同样的“收缩”过程,即取超相对论极限$c \rightarrow 0$,其中$c$是光速,但对正则变量进行了两种不同的一致性重新标度。这个过程可以应用于一般的洛伦兹不变理论($p$形式的规范场,更高自旋自由理论等),并具有明确提供一个作用量原理的优点,从该原理中遵循电收缩或磁收缩动力学(而不仅仅是运动方程)。尽管不是很明显,这个哈密顿作用原理被证明是卡罗尔不变的。在$p$ -形式的情况下,我们明确地构造了一个等价的明显的卡罗尔不变的作用原理的每一个卡罗尔压缩。虽然电收缩的显协变变分描述相当直接,但磁收缩的描述则更为微妙,涉及到一个额外的纯规范场,它的消除修改了场的卡罗尔变换。我们还处理重力,这构成了我们的研究的主要动机之一,并为此我们提供了两种不同的压缩哈密顿形式。

英文摘要:

We consider Carroll-invariant limits of Lorentz-invariant field theories. We show that just as in the case of electromagnetism, there are two inequivalent limits, one "electric" and the other "magnetic". Each can be obtained from the corresponding Lorentz-invariant theory written in Hamiltonian form through the same "contraction" procedure of taking the ultrarelativistic limit $c \rightarrow 0$ where $c$ is the speed of light, but with two different consistent rescalings of the canonical variables. This procedure can be applied to general Lorentz-invariant theories ($p$-form gauge fields, higher spin free theories etc) and has the advantage of providing explicitly an action principle from which the electrically-contracted or magnetically-contracted dynamics follow (and not just the equations of motion). Even though not manifestly so, this Hamiltonian action principle is shown to be Carroll invariant. In the case of $p$-forms, we construct explicitly an equivalent manifestly Carroll-invariant action principle for each Carroll contraction. While the manifestly covariant variational description of the electric contraction is rather direct, the one for the magnetic contraction is more subtle and involves an additional pure gauge field, whose elimination modifies the Carroll transformations of the fields. We also treat gravity, which constitutes one of the main motivations of our study, and for which we provide the two different contractions in Hamiltonian form.

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。

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