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arXiv 2606.04085hep-thcond-mat.stat-mechgr-qc
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从内部粗粒化:$S^3$ 上的 Wilson-Fisher 普适性

Coarse graining from within: Wilson-Fisher universality on $S^3$

INAF – Osservatorio Astrofisico di Catania(意大利国家天体物理研究所卡塔尼亚天文台);INFN, Sezione di Catania(意大利国家核物理研究所卡塔尼亚分部);Institute for Quantum Gravity, Friedrich-Alexander-Universität Erlangen-Nürnberg(埃尔朗根-纽伦堡大学量子引力研究所);Dipartimento di Fisica e Astronomia, Università di Catania(卡塔尼亚大学物理与天文学系)

Alfio M. Bonanno, Renata Ferrero, Giovanni Oglialoro

AI总结:

本文提出一种基于协变拉普拉斯算子的本征谱截断的协变重正化群方法,并在 $S^3$ 上的标量场中验证了 Wilson-Fisher 普适性,无需动量壳层,且临界指数受紧致谱影响微弱。

摘要:

Wilson 重正化通常用动量空间表述,但在弯曲背景上动量壳层没有不变意义。我们将其替换为内禀谱截断,通过协变拉普拉斯算子对模式排序,并用重正化群 (RG) 单位中的系统大小设定截断分辨率。对于 $S^3$ 上的标量场,这产生了一个协变的、无动量的 RG 流,其迹是球谐函数的精确和。当球面相对于粗粒化尺度很大时,恢复标准的平空间流。作为一个非平凡测试,紧致谱流实现了无动量壳层的 Wilson-Fisher 普适性:相互作用不动点在有限分辨率下存在,有一个相关方向,并平滑地趋近其平空间对应物,临界指数仅受紧致谱的微弱影响。

英文摘要:

Wilsonian renormalization is usually formulated in momentum space, but on curved backgrounds momentum shells have no invariant meaning. We replace them by an intrinsic spectral cutoff, ordering modes by the covariant Laplacian and setting the cutoff resolution by the system size in renormalization group (RG) units. For a scalar field on $S^3$, this yields a covariant, momentum-free RG flow whose trace is an exact sum over spherical harmonics. The standard flat-space flow is recovered when the sphere is large compared with the coarse-graining scale. As a nontrivial test, the compact spectral flow realizes Wilson-Fisher universality without momentum shells: the interacting fixed point survives at finite resolution, has one relevant direction, and approaches its flat-space counterpart smoothly, with critical exponents only weakly affected by the compact spectrum.

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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