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arXiv 2503.03216gr-qchep-th
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关于协变与正则哈密顿形式论:弱孤立视界

On covariant and canonical Hamiltonian formalisms: Weakly Isolated Horizons

Alejandro Corichi, Juan D. Reyes, Tatjana Vukasinac

AI总结:

本文研究协变与正则哈密顿形式论在带孤立视界边界时空中的关系,通过分析差异并调整相空间实现两者结果完全对应,阐明边界项作用。

摘要:

经典规范理论的哈密顿描述是一个研究充分的课题。两种最著名的方法,即协变和正则哈密顿形式论,在文献中受到了广泛关注。然而,我们认为,对它们之间关系的完全理解尚不可得,特别是对于在带边界区域上定义的规范理论。在此,我们考虑这个问题,针对以孤立视界作为内边界(代表平衡态黑洞)的时空,并评估它们相应的描述是否可以被视为等价。首先,我们将重新审视并重新分析这两种形式论,重点关注以前未考虑的一些微妙之处。接下来我们表明,如果按表面价值进行比较,两种形式论之间存在微妙的差异,例如在视界能量(理论的一个物理可观测量)的推导以及边界自由度的数量方面。乍一看,正则形式论似乎引入了一些额外的模糊性,使得两种形式论之间的比较更具挑战性。我们分析了两种方法中不同的可能解释,并展示了如何在协变和正则形式论的结果之间获得完全对应。我们还表明,这种对应可以在原始相空间中实现,无需边界自由度,或者通过适当扩展相空间并添加视界自由度来实现。在此过程中,我们阐明了辛结构中边界项与边界自由度相关的作用。

英文摘要:

The Hamiltonian description of classical gauge theories is a well studied subject. The two best known approaches, namely the covariant and canonical Hamiltonian formalisms have received a lot of attention in the literature. However, in our opinion, a full understanding of the relation between them is not available, specially for gauge theories that are defined over regions with boundaries. Here we consider this issue, for spacetimes with isolated horizons as inner boundaries (representing black holes in equilibrium), and assess whether their corresponding descriptions can be seen as equivalent. First, we shall review and reanalyze both formalisms from anew, focusing on some subtleties not considered before. Next we show that, if we compare them at face value, there are subtle differences between both formalisms, for instance in the derivation of horizon energy, a physical observable of the theory, as well as in the number of boundary degrees of freedom. At first sight, it seems that the canonical formalism introduces some additional ambiguities that make more challenging the comparison between both formalisms. We analyze different possible interpretations in both approaches and show how one can obtain complete correspondence between results within covariant and canonical formalisms. We also show that the correspondence can be achieved in the original phase spaces, with no boundary degrees of freedom, or by appropriately extending them by adding horizon degrees of freedom. Along the way, we shed light on the role of boundary terms in the symplectic structure in relation to boundary degrees of freedom.

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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