Monodromy in the CMB: Gravity waves and string inflation

被引:750
作者
Silverstein, Eva [1 ]
Westphal, Alexander
机构
[1] Stanford Univ, SLAC, Stanford, CA 94305 USA
来源
PHYSICAL REVIEW D | 2008年 / 78卷 / 10期
基金
美国国家科学基金会;
关键词
D O I
10.1103/PhysRevD.78.106003
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present a simple mechanism for obtaining large-field inflation, and hence a gravitational wave signature, from string theory compactified on twisted tori. For nil manifolds, we obtain a leading inflationary potential proportional to phi(2/3) in terms of the canonically normalized field phi, yielding predictions for the tilt of the power spectrum and the tensor-to-scalar ratio, n(s)approximate to 0.98 and r approximate to 0.04 with 60 e-foldings of inflation; we note also the possibility of a variant with a candidate inflaton potential proportional to phi(2/5). The basic mechanism involved in extending the field range-monodromy in D-branes as they move in circles on the manifold-arises in a more general class of compactifications, though our methods for controlling the corrections to the slow-roll parameters require additional symmetries.
引用
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页数:21
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