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arXiv 2412.03466quant-phhep-lathep-th
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离散时空中的狄拉克真空

The Dirac Vacuum in Discrete Spacetime

Chaitanya Gupta, Anthony J. Short

AI总结:

本研究针对离散时空费米子量子元胞自动机模型引入狄拉克海时出现的正负能态新边界及粒子对易产生的问题,基于离散时间能量模性的成因,提出修正模型将能态拉离边界的方案。

摘要:

我们研究在离散时空的费米子量子元胞自动机模型中引入狄拉克海,该模型在连续极限下近似于狄拉克方程。但如果我们尝试填充“负”能态,就会遇到一个问题:在正能态和负能态之间会产生一个新的边界,在该边界处粒子对产生在能量上似乎是有利的。出现这一现象的原因是离散时间模型中能量的模性。随后我们提出了一种可能的修正方案,通过修改模型将能态拉离这个新边界。

英文摘要:

We consider introducing the Dirac sea in a quantum cellular automata model of fermions in discrete spacetime which approximates the Dirac equation in the continuum limit. However, if we attempt to fill up the `negative' energy states, we run into a problem. A new boundary is created between positive and negative energy states, at which pair creation seems energetically favourable. This happens because of the modular nature of energy in discrete time models. We then suggest a possible remedy by amending the model, in order to pull states away from the new boundary.

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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