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具有变化动力函数的向量曲率

Vector Curvaton with varying Kinetic Function

Konstantinos Dimopoulos, Mindaugas Karciauskas, Jacques M. Wagstaff

备注：
39 pages, 3 figures, single-column RevTeX, published version
发表信息：
Phys.Rev.D81:023522,2010
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摘要：

一个新的模型实现的矢量曲率范式的介绍和分析。该模型由一个单一的大质量阿贝尔矢量场，麦克斯韦型动力学项。通过假设动力学函数和质量的矢量场是适当的变化在通货膨胀期间，它表明，超视界扰动的标度不变的频谱可以产生。这些微扰可以导致宇宙的曲率微扰。如果向量场在暴胀结束时仍然是轻的，我们发现它可以在曲率扰动的谱和双谱中产生大量的统计各向异性。在这种情况下，曲率扰动的非高斯性主要是各向异性的，这将是一个可测试的预测在不久的将来。另一方面，如果在暴胀结束时矢量场是重的，则证明粒子的产生近似是各向同性的，并且矢量场本身可以引起曲率扰动，而不直接涉及任何基本的标量场。这两种可能性的参数空间被证明是相当大的。最后，玩具模型表明，所需的矢量场的质量和动力学函数的变化，可以现实地获得，没有不自然的调谐，在超重力或超弦的背景下。

英文摘要：

A new model realisation of the vector curvaton paradigm is presented and analysed. The model consists of a single massive Abelian vector field, with a Maxwell type kinetic term. By assuming that the kinetic function and the mass of the vector field are appropriately varying during inflation, it is shown that a scale invariant spectrum of superhorizon perturbations can be generated. These perturbations can contribute to the curvature perturbation of the Universe. If the vector field remains light at the end of inflation it is found that it can generate substantial statistical anisotropy in the spectrum and bispectrum of the curvature perturbation. In this case the non-Gaussianity in the curvature perturbation is predominantly anisotropic, which will be a testable prediction in the near future. If, on the other hand, the vector field is heavy at the end of inflation then it is demonstrated that particle production is approximately isotropic and the vector field alone can give rise to the curvature perturbation, without directly involving any fundamental scalar field. The parameter space for both possibilities is shown to be substantial. Finally, toy-models are presented which show that the desired variation of the mass and kinetic function of the vector field can be realistically obtained, without unnatural tunings, in the context of supergravity or superstrings.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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