Spatially modulated vacua in a Lorentz-invariant scalar field theory

被引：16

作者：

Nitta, Muneto ^{[1
]}

Sasaki, Shin ^{[2
]}

Yokokura, Ryo ^{[3
]}

机构：

[1] Keio Univ, Ctr Nat Sci, Dept Phys & Res & Educ, Hiyoshi 4-1-1, Yokohama, Kanagawa 2238521, Japan

[2] Kitasato Univ, Dept Phys, Sagamihara, Kanagawa 2520373, Japan

[3] Keio Univ, Dept Phys, Yokohama, Kanagawa 2238522, Japan

来源：

EUROPEAN PHYSICAL JOURNAL C | 2018年 / 78卷 / 09期

基金：

日本学术振兴会;

关键词：

SUPERCONDUCTIVITY; MATTER; ALIGNMENT;

D O I：

10.1140/epjc/s10052-018-6235-9

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

Spatial modulation has been studied for a long time in condensed matter, nuclear matter and quark matter, where the manifest Lorentz invariance is lost due to the finite density/temperature effects and so on. In this paper, spatially modulated vacua at zero temperature and zero density are studied in Lorentz invariant field theories. We first propose an adaptation of the Nambu-Goldstone theorem to higher derivative theories under the assumption of the absence of ghosts: when a global symmetry is spontaneously broken due to vacuum expectation values of space-time derivatives of fields, a Nambu-Goldstone (NG) boson appears without a canonical kinetic (quadratic derivative) term with a quartic derivative term in the modulated direction while a Higgs boson appears with a canonical kinetic term. We demonstrate this in a simple model allowing (meta) stable modulated vacuum of a phase modulation (Fulde-Ferrell state), where an NG mode associated with spontaneously broken translational and U(1) symmetries appears.

引用

页数：10

共 45 条

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