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arXiv 2001.06024hep-thcond-mat.quant-gascond-mat.str-el
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自发破碎的助推器和戈德斯通连续体

Spontaneously broken boosts and the Goldstone continuum

Lasma Alberte, Alberto Nicolis

摘要:

自然界中普遍存在自发破缺的助推不变性,但却看不到与之相关的戈德斯通玻色子。我们讨论了为什么一些微妙之处是预期在戈德斯通现象自发打破助推,并推导出相应的量子力学,非微扰戈德斯通定理。尽管与更标准的戈德斯通定理的相似之处,我们通过例子表明,我们可以遵守相当不寻常的低能量激发谱。特别地,对于非相对论性费米液体,我们证明了它服从粒子-空穴连续。据我们所知,这是第一个由连续统而不是(近似稳定的)单粒子戈德斯通玻色子态遵守戈德斯通定理的例子。

英文摘要:

The spontaneous breaking of boost invariance is ubiquitous in nature, yet the associated Goldstone bosons are nowhere to be seen. We discuss why some subtleties are to be expected in the Goldstone phenomenon for spontaneously broken boosts, and derive the corresponding quantum mechanical, non-perturbative Goldstone theorem. Despite similarities with more standard Goldstone theorems, we show by examples that ours can be obeyed by quite unusual spectra of low-energy excitations. In particular, for non-relativistic Fermi liquids, we prove that it is obeyed by the particle-hole continuum. To the best of our knowledge, this is the first example of a Goldstone theorem obeyed by a continuum rather than by (approximately stable) single-particle Goldstone boson states.

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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