Fibre inflation: observable gravity waves from IIB string compactifications
Fibre inflation: observable gravity waves from IIB string compactifications
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DOI：
10.1088/1475-7516/2009/03/013
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发表时间：
2009-03-01
影响因子：
6.4
通讯作者：
Quevedo, F.
中科院分区：
文献类型：
--
作者：
Cicoli, M.;Burgess, C. P.;Quevedo, F.
我们引入了一个简单的暴胀弦模型，在这个模型中，暴胀场可以取跨普朗克值，同时驱动一段时间的慢卷暴胀。这自然导致了大场暴胀的实现，因为暴胀时期可以用单场标量势V = V-0（3-4 e（-（phi）over cap/root 3））很好地描述。值得注意的是，对于一个广泛的真空类别，所有可调参数仅通过总系数V-0进入，特别是不进入慢滚参数。因此，它们纯粹由e-折叠的数目N-e决定，因此不是独立的：N-e类似于或等于3/2 η（2）。这意味着像原始标量-张量振幅r和标量谱倾斜n（s）这样的可观测量之间存在类似的关系：r类似于或等于6（n（s）- 1）（2）。N-e本身更依赖于模型，因为它部分取决于后通货膨胀的再热历史。在一个简单的再加热方案中，T-rh的再加热温度接近或等于10（9）GeV，N-e接近或等于58，对应于n（s）接近或等于0.970，r接近或等于0.005，在未来的观测范围内。该模型是一个例子，一类自然产生的背景下，IIB型字符串紧化与大体积模量稳定，并利用通用存在的卡勒模量，其主要外观在标量潜在的产生串循环校正卡勒潜力。暴胀子场是K3纤维卡-丘流形的Kahler模的组合。我们相信，这类模型中可能有大量的模型--“高纤维模型”--其中暴胀子从纤维中足够远的地方开始，产生可观测到的大原始重力波。
We introduce a simple string model of inflation, in which the inflation field can take trans-Planckian values while driving a period of slow-roll inflation. This leads naturally to a realisation of large field inflation, inasmuch as the inflationary epoch is well described by the single-field scalar potential V = V-0 (3-4 e(-(phi) over cap/root 3)). Remarkably, for a broad class of vacua all adjustable parameters enter only through the overall coefficient V-0, and in particular do not enter into the slow-roll parameters. Consequently these are determined purely by the number of e-fold ings, N-e, and so are not independent: epsilon similar or equal to 3/2 eta(2). This implies similar relations among observables like the primordial scalar-to-tensor amplitude, r, and the scalar spectral tilt, n(s): r similar or equal to 6(n(s) - 1)(2). N-e is itself more model-dependent since it depends partly on the post-inflationary reheat history. In a simple reheating scenario a reheating temperature of T-rh similar or equal to 10(9) GeV gives N-e similar or equal to 58, corresponding to n(s) similar or equal to 0.970 and r similar or equal to 0.005, within reach of future observations. The model is an example of a class that arises naturally in the context of type IIB string compactifications with large-volume moduli stabilisation, and takes advantage of the generic existence there of Kahler moduli whose dominant appearance in the scalar potential arises from string loop corrections to the Kahler potential. The inflaton field is a combination of Kahler moduli of a K3-fibered Calabi-Yau manifold. We believe there are likely to be a great number of models in this class - "high-fibre models" - in which the inflaton starts off far enough up the fibre to produce observably large primordial gravity waves.