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arXiv 2401.09458hep-lathep-th
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格点规范-基础标量模型中区分禁闭-Higgs相的新规范无关相变

New gauge-independent transition separating confinement-Higgs phase in the lattice gauge-fundamental scalar model

Ryu Ikeda, Kei-Ichi Kondo, Akihiro Shibata, Seikou Kato

AI总结:

本文通过结合原始标量场与基于规范协变分解得到的色方向场,构造规范不变的新型算符,在SU(2)格点规范-基础标量模型中无规范固定地数值发现一条新相变线,将禁闭-Higgs相完全分离为禁闭相和Higgs相,并从整体对称性自发破缺角度给出物理解释。

摘要:

标量场处于规范群基础表示下的格点规范-标量模型具有单一的禁闭-Higgs相,这即为著名的Fradkin-Shenker-Osterwalder-Seiler解析连续性定理:禁闭区域和Higgs区域是解析连续单一相的子区域,它们之间不存在热力学相变。然而,在本次报告中,我们证明可以定义一类新型算符,从而能够完全分离禁闭相和Higgs相。事实上,这些算符是在规范不变的步骤中构造的,其方式是将原始标量场与所谓的色方向场结合起来,而色方向场是通过基于Cho-Duan-Ge-Shabanov和Faddeev-Niemi提出的规范场规范协变分解进行场变量变换得到的。我们在不进行任何规范固定的情况下,对SU(2)规范群的模型进行了数值模拟,发现了一条新的相变线:在弱规范耦合区域,该相变线与传统的热力学相变线一致;在强规范耦合区域,它将禁闭-Higgs相划分为两个分离的相,即禁闭相和Higgs相。由于数值模拟中未施加任何规范固定,所有结果均以规范无关的方式获得。此外,我们从整体对称性自发破缺的角度对新相变给出了物理解释。本次报告基于预印本[1]。

英文摘要:

The lattice gauge-scalar model with the scalar field in the fundamental representation of the gauge group has a single confinement-Higgs phase which is well-known as the Fradkin-Shenker-Osterwalder-Seiler analytic continuity theorem: Confinement and Higgs regions are subregions of an analytically continued single phase and there are no thermodynamics phase transitions between them. In this talk, however, we show that we can define new type of operators which enable to separate completely the confinement phase and the Higgs phase. In fact, they are constructed in the gauge-invariant procedure by combining the original scalar field and the so-called color-direction field which is obtained by change of field variables based on the gauge-covariant decomposition of the gauge field due to Cho-Duan-Ge-Shabanov and Faddeev-Niemi. We perform the numerical simulations for the model with SU(2) gauge group without any gauge fixing and find a new transition line which agrees with the conventional thermodynamic transition line in the weak gauge coupling and divides the confinement-Higgs phase into two separate phases, confinement and the Higgs, in the strong gauge coupling. All results are obtained in the gauge-independent way, since no gauge fixing has been imposed in the numerical simulations. Moreover, we give a physical interpretation for the new transition from the viewpoint of the spontaneous breaking of a global symmetry. This talk is based on the preprint [1].

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