翘曲因子与引力波谱
Warp factor and the gravitational wave spectrum
摘要：
紧凑的额外维度的一个独特标志是一个由引力波组成的卡鲁扎-克莱因塔。受这种前景的启发，我们计算了相应的频谱上的扭曲的环形背景。我们特别评估了翘曲因子对光谱的影响。为此，我们使用D-膜和orientifolds产生的标准弦紧化的完整翘曲因子H，从而连接到最近的工作stringy德西特结构。有问题的区域接近于H < 0的定向褶皱，导致光谱中的非物理快子模式。我们开发的工具，克服了这一困难，导致快子免费频谱。我们表明，特别是，翘曲因子可以降低至少69%的第一卡鲁扎-克莱因质量。
英文摘要：
A distinct signature of compact extra dimensions would be a Kaluza-Klein tower of gravitational waves. Motivated by this prospect, we compute the corresponding spectrum on a warped toroidal background. We evaluate in particular the impact of the warp factor on the spectrum. To that end, we use the complete warp factor H of standard string compactifications, generated by D-branes and orientifolds, thus connecting to recent works on stringy de Sitter constructions. The problematic region close to an orientifold where H < 0 leads to unphysical tachyonic modes in the spectrum. We develop tools that overcome this difficulty and lead to a tachyon-free spectrum. We show, in particular, that the warp factor can lower the first Kaluza-Klein mass by at least 69%.
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