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arXiv 0908.2808hep-thhep-ph
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规范弦对偶中步行解的轻标量

A light scalar from walking solutions in gauge-string duality

Daniel Elander, Carlos Nunez, Maurizio Piai

摘要:

我们认为,IIB型背景所产生的强耦合限制Nc D5膜包裹在S2,并把我们的注意力集中在一类特殊的解决方案,表现出步行行为。我们数值计算了这类真空周围标量涨落的谱。除了两个切口和收敛于其中一个分支点的单极序列之外,谱还包含一个孤立标量,其质量被行走区域的长度抑制。在步行区近似的标度不变性对称性表明,这可以解释为一个轻玻色子,伪戈德斯通玻色子的双折射。

英文摘要:

We consider the type-IIB background generated by the strong-coupling limit of Nc D5 branes wrapped on S2, and focus our attention on a special class of solutions that exhibit walking behavior. We compute numerically the spectrum of scalar fluctuations around vacua of this class. Besides two cuts, and sequences of single poles converging on one of the branch points, the spectrum contains one isolated scalar, the mass of which is suppressed by the length of the walking region. Approximate scale-invariance symmetry in the walking region suggests that this be interpreted as a light dilaton, the pseudo-Goldstone boson of dilatations.

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