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arXiv 1611.03498hep-thhep-phquant-ph
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关于复高阶导数理论的量子化和避免Ostrogradsky鬼

On the Quantisation of Complex Higher Derivative Theories and Avoiding the Ostrogradsky Ghost

Martti Raidal, Hardi Veermäe

摘要:

一般的高阶导数理论被认为从根本上是非物理的,因为它们包含奥斯特罗格拉茨基幽灵。我们表明,在复杂的经典力学,它是可能的,以构建更高的衍生理论,绕过Ostrogradsky定理,并有一个真正的能量谱,是有界的从下面。复变理论可以正则量子化。由此产生的量子理论不受动力学不稳定性的影响,并且在不违反对应原理的情况下保持了通常的概率解释。作为概念证明,我们构造了一类稳定的相互作用复高阶导数理论。这个一致的和规范的框架,使我们能够分析以前的尝试,以避免鬼使用非规范的量子化方案,如李-威克理论,狄拉克-泡利量子化或PT对称量子力学。理解任何动力学稳定的高阶导数理论中的幽灵的关键是接受它背后的复杂系统。

英文摘要:

Generic higher derivative theories are believed to be fundamentally unphysical because they contain Ostrogradsky ghosts. We show that within complex classical mechanics it is possible to construct higher derivative theories that circumvent the Ostrogradsky theorem and have a real energy spectrum that is bounded from below. The complex theory can be canonically quantised. The resulting quantum theory does not suffer from the kinetic instability and maintains the usual probabilistic interpretation without violating the correspondence principle. As a proof of concept, we construct a class of stable interacting complex higher derivative theories. This consistent and canonical framework allows us to analyse previous attempts to avoid the ghosts that use non-canonical quantisation schemes, such as the Lee-Wick theories, Dirac-Pauli quantisation or PT-symmetric quantum mechanics. The key to understand the would-be ghosts in any kinetically stable higher derivative theory is to accept the complex system behind it.

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