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arXiv 1906.02597cond-mat.stat-mechcond-mat.str-elhep-thquant-ph
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可积自由场论中的热化/弛豫:算子热化假设

Thermalization/Relaxation in integrable and free field theories: an Operator Thermalization Hypothesis

Philippe Sabella-Garnier, Koenraad Schalm, Tereza Vakhtel, Jan Zaanen

摘要:

自由或可积理论通常被认为是太受限制而不能热化。例如,自由场的延迟两点函数,即使在热状态下,也不会在很长时间内衰减到零。另一方面,临界横场伊辛的磁化率已知会热化,尽管该理论可以通过乔丹-维格纳变换映射到自由费米子的磁化率。我们通过澄清在哪些条件下保守电荷可以阻止线性响应水平的弛豫以及如何克服这种阻碍来调和这两种说法。特别地,我们给出了滞后格林函数衰减的一个必要条件。我们给出了明确的例子,复合运营商的自由理论,但满足该条件,因此热化。我们把这种现象称为算子热化假说,作为本征态热化假说的逆命题。

英文摘要:

Free or integrable theories are usually considered to be too constrained to thermalize. For example, the retarded two-point function of a free field, even in a thermal state, does not decay to zero at long times. On the other hand, the magnetic susceptibility of the critical transverse field Ising is known to thermalize, even though that theory can be mapped by a Jordan-Wigner transformation to that of free fermions. We reconcile these two statements by clarifying under which conditions conserved charges can prevent relaxation at the level of linear response and how such obstruction can be overcome. In particular, we give a necessary condition for the decay of retarded Green's functions. We give explicit examples of composite operators in free theories that nevertheless satisfy that condition and therefore do thermalize. We call this phenomenon the Operator Thermalization Hypothesis as a converse to the Eigenstate Thermalization Hypothesis.

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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