Statistical anisotropy from vector curvaton in D-brane inflation

Statistical anisotropy from vector curvaton in D-brane inflation
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D 膜膨胀中矢量曲率的统计各向异性

DOI:
10.1016/j.nuclphysb.2012.11.010
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发表时间:
2013
期刊:
影响因子:
2.8
通讯作者:
Dimopoulos K
Dimopoulos K
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Dimopoulos K

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我们研究了在一个简单的玩具模型中嵌入向量曲率范式在IIB型弦理论暴胀的D膜模型中的可能性。向量曲率等同于U(1)规范场,它存在于D3-膜的世界体积上,D3-膜可以是静止的,也可以在内部空间中进行一般运动。该矢量场被认为是一个旁观者场,它调节着矢量场的演化。在这种设置中,假设矢量曲率子演化为e− a2,其中a(t)是比例因子,则矢量曲率能够在曲率扰动的谱和双谱中产生可测量的统计各向异性。我们的工作是探索这种独特的特征如何产生于自然出现在宇宙学弦理论模型中的几个光场的第一步。
We investigate the possibility of embedding the vector curvaton paradigm in D-brane models of inflation in type IIB string theory in a simple toy model. The vector curvaton is identified with the U(1) gauge field that lives on the world volume of a D3-brane, which may be stationary or undergoing general motion in the internal space. The dilaton is considered as a spectator field which modulates the evolution of the vector field. In this set-up, the vector curvaton is able to generate measurable statistical anisotropy in the spectrum and bispectrum of the curvature perturbation assuming that the dilaton evolves as e−ϕ∝a2where a(t) is the scale factor. Our work constitutes a first step towards exploring how such distinctive features may arise from the presence of several light fields that naturally appear in string theory models of cosmology.
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