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arXiv 1503.07153hep-thhep-phmath-phmath.MP
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聚合物量子化、稳定性和高阶时间导数项

Polymer quantization, stability and higher-order time derivative terms

Patricio Cumsille, Carlos M. Reyes, Sebastian Ossandon, Camilo Reyes

摘要:

研究了利用量子力学的聚合物推广的高阶时间导数理论的稳定性。首先,我们专注于著名的Pais-Uhlenbeck模型,并通过铸造的理论到两个解耦的和的可能性,基本离散隐含在量子引力理论可能作为一个自然的调节器紫外奇异性产生的量子场论已被深入研究。在这里,沿着相同的期望,我们调查是否一个非标准的表示,称为聚合物表示可以平滑掉大量的负能量,折磨高阶时间导数理论的哈密顿量,使理论不稳定时,相互作用发挥作用。我们研究的是四阶Pais-Uhlenbeck模型,它可以表示为两个解耦的谐振子之和,一个产生正能量,另一个产生负能量。正如预期的那样,这种模型的薛定谔量子化导致稳定性问题或称为鬼的负范数状态。在聚合物量子化的框架内,我们显示了新的区域的存在,其中的哈密顿量可以定义为从下面有界。

英文摘要:

The stability of higher-order time derivative theories using the polymer extension of quantum mechanics is studied. First, we focus on the well-known Pais-Uhlenbeck model and by casting the theory into the sum of two decoupled The possibility that fundamental discreteness implicit in a quantum gravity theory may act as a natural regulator for ultraviolet singularities arising in quantum field theory has been intensively studied. Here, along the same expectations, we investigate whether a nonstandard representation, called polymer representation can smooth away the large amount of negative energy that afflicts the Hamiltonians of higher-order time derivative theories; rendering the theory unstable when interactions come into play. We focus on the fourth-order Pais-Uhlenbeck model which can be reexpressed as the sum of two decoupled harmonic oscillators one producing positive energy and the other negative energy. As expected, the Schrodinger quantization of such model leads to the stability problem or to negative norm states called ghosts. Within the framework of polymer quantization we show the existence of new regions where the Hamiltonian can be defined well bounded from below.

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