arXiv 0810.13032008-10hep-thastro-ph

膜-反膜膨胀有多微妙？

How Delicate is Brane-Antibrane Inflation?

Loison Hoi, James M. Cline

备注：: 33 pages, 12 figures. v2: added discussion of an alternate measure of fine-tuning; published version
发表信息：: Phys.Rev.D79:083537,2009
DOI：: 10.1103/PhysRevD.79.083537

摘要：

我们系统地探索了最先进的膜-反膜膨胀模型（Baumann { \it et al}.，arXiv：0706.0360，arXiv：0705.3837），它是从弦论中最严格导出的方法之一，应用了宇宙背景探测器归一化和对谱指数的约束。我们改进了以前的治疗提升的反膜，并表明，从非暴胀喉咙的贡献发挥了重要作用，在实现一个平坦的暴胀潜力。为了量化的微调所需的模型的程度，我们定义了一个有效的体积的参数空间的一部分，这是符合实验的约束条件，并使用蒙特卡罗方法来寻找一组最佳的参数，我们表明，微调的程度减轻了8个数量级相对于一个基准点，这是以前被认为是。事实上，接近最佳参数值时，不再需要对任何参数进行微调。我们表明，在这个自然区域的参数空间，较大的值接近0.99（仍然在2 $σ$的WMAP 5中心值）的$n_s$的青睐，给一个新的方面的模型的可测试性。

英文摘要：

We systematically explore the parameter space of the state-of-the-art brane-antibrane inflation model (Baumann {\it et al}., arXiv:0706.0360, arXiv:0705.3837) which is one of the most rigorously derived from string theory, applying the cosmic background explorer normalization and constraint on the spectral index. We improve on previous treatments of uplifting by antibranes and show that the contributions from noninflationary throats play an important role in achieving a flat inflationary potential. To quantify the degree of fine-tuning needed by the model, we define an effective volume in the part of parameter space which is consistent with experimental constraints, and using Monte Carlo methods to search for a set of optimal parameters, we show that the degree of fine-tuning is alleviated by 8 orders of magnitude relative to a fiducial point which has previously been considered. In fact, close to the optimal parameter values, fine-tuning is no longer needed for any of the parameters. We show that in this natural region of the parameter space, larger values of $n_s$ close to 0.99 (still within 2$σ$ of the WMAP5 central value) are favored, giving a new aspect of testability to the model.

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