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arXiv 1306.0723hep-th
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从标量场动力学看重力对厚膜形成的影响

Gravity effects on thick brane formation from scalar field dynamics

Alexander A. Andrianov, Vladimir A. Andrianov, Oleg O. Novikov

摘要:

研究了由标量物质动力学诱导的$AdS_5$型弯曲几何和薄膜缺陷触发的5维时空中厚膜的形成.标量物质被看作是由两个场组成的,这两个场具有$O(2)$对称的自相互作用,并具有明显的$O(2)$对称性破缺。其中之一是围绕扭结背景的厚膜形成模式,另一个是希格斯场类型的,也可能发展出经典背景。标量物质与引力相互作用的最小形式和重力的影响(准)局域标量涨落的使用规范不变变量适合微扰展开计算。计算是在产生希格斯型标量场的非平凡v.e.v.的组合宇称对称性自发破缺临界点附近进行的。研究了薄膜缺陷下轻局域标量态质量谱中的非微扰不连续引力效应。当奇异势垒形成具有两个无限高的壁的势阱,并且局域态的离散谱与体相完全隔离时,具有负张力的薄膜恰好是最奇怪的情况。

英文摘要:

The formation of a thick brane in five-dimen\-sional space-time is investigated when warp geometries of $AdS_5$ type are induced by scalar matter dynamics and triggered by a thin-brane defect. The scalar matter is taken to consist of two fields with $O(2)$ symmetric self interaction and with manifest $O(2)$ symmetry breaking by terms quadratic in fields. One of them serves as a thick brane formation mode around a kink background and another one is of a Higgs-field type which may develop a classical background as well. Scalar matter interacts with gravity in the minimal form and gravity effects on (quasi)localized scalar fluctuations are calculated with usage of gauge invariant variables suitable for perturbation expansion. The calculations are performed in the vicinity of the critical point of spontaneous breaking of the combined parity symmetry where a non-trivial v.e.v. of the Higgs-type scalar field is generated. The nonperturbative discontinuous gravitational effects in the mass spectrum of light localized scalar states are studied in the presence of a thin-brane defect. The thin brane with negative tension happens to be the most curious case when the singular barriers form a potential well with two infinitely tall walls and the discrete spectrum of localized states arises completely isolated from the bulk.

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