arXiv 1003.56692010-03hep-phhep-th

Randall-Sundrum和Strings

Randall-Sundrum and Strings

Matthew Reece, Lian-Tao Wang

备注：: 35 pages, 2 figures. v2: References added, minor changes. (JHEP published version)
发表信息：: JHEP 1007:040,2010
DOI：: 10.1007/JHEP07(2010)040

摘要：

我们研究了嵌入弦论引起的弱电对称性破缺的Randall-Sundrum有效理论中的弦激发。RS是一个约束规范理论的对偶，我们希望它有“QCD弦”，或色通量管。类RS理论的弦结构使我们能够研究这些弦态的质量，它通常随着对偶规范理论的颜色数N的一个小的分数幂而增长。对于类RS理论，N有两个已知的强约束。第一个原因是要求标准模型计量联轴器在低比例尺下不具有朗道极点。第二个是要求早期宇宙中的一阶限制相变能够在不留下空宇宙的情况下进行，即气泡成核的速率不能太小。我们发现，对N的这些限制意味着弦态一般至多比最轻的KK态重几倍，我们不能自洽地保持在极限N，λ>> 1。我们研究各种弦结构的AdS或RS的背景，包括orbifolds，理论M5膜，理论D4膜，和最近的F-理论建设的Polchinski和Silverstein。在每一种情况下，我们都发现新的弦态的质量有很强的界限。我们简要地讨论了重要的现象学的影响，由于存在这样的光弦激发，如精密电弱和味观测，以及对撞机信号。

英文摘要：

We investigate stringy excitations in Randall-Sundrum effective theories for electroweak symmetry breaking arising from embedding in string theory. RS is dual to a confining gauge theory, which we expect to have "QCD strings," or color flux tubes. Stringy constructions of RS-like theories allow us to investigate the mass of these string states, which typically grows with a small fractional power of the number of colors N of the dual gauge theory. There are two known strong constraints on N for RS-like theories. The first arises from demanding that the Standard Model gauge couplings do not have a Landau pole at low scales. The second arises from demanding that the first-order confining phase transition in the early universe is able to proceed without leaving an empty universe, i.e. that the rate of bubble nucleation is not too small. We find that these constraints on N imply that string states are generically at most a factor of a few heavier than the lightest KK states, and we cannot self-consistently remain in the limit N, lambda >> 1. We examine various string constructions of AdS or RS-like backgrounds, including orbifolds, theories on M5-branes, theories on D4-branes, and the recent F-theory construction of Polchinski and Silverstein. In every case we find that there are strong bounds on the mass of new stringy states. We briefly discuss important phenomenological implications due to the presence of such light stringy excitations, such as precision electroweak and flavor observables, as well as collider signals.

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