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arXiv 1111.1919astro-ph.COhep-th
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暴胀结束时原始各向异性的产生问题

Issues on Generating Primordial Anisotropies at the End of Inflation

Razieh Emami, Hassan Firouzjahi

摘要:

我们重新审视了在具有规范场的暴胀模型中暴胀结束时产生原始各向异性的想法。具体地说,我们考虑了荷电混合暴胀模型,其中瀑布场在U(1)规范场下荷电,因此暴胀结束的表面由暴胀子和规范场共同控制。适当地使用Δ N形式主义,我们发现,在膨胀结束时产生的各向异性从规范场波动的宇宙学尺度上的指数抑制。这是因为规范场在暴胀过程中呈指数级演化,而为了在暴胀结束时产生可观的各向异性,旁观者规范场必须被冻结和标度不变。我们认为,这是一个通用的功能,也就是说,一个不能产生可观察到的各向异性在年底内的FRW背景的通货膨胀。

英文摘要:

We revisit the idea of generating primordial anisotropies at the end of inflation in models of inflation with gauge fields. To be specific we consider the charged hybrid inflation model where the waterfall field is charged under a U(1) gauge field so the surface of end of inflation is controlled both by inflaton and the gauge fields. Using delta N formalism properly we find that the anisotropies generated at the end of inflation from the gauge field fluctuations are exponentially suppressed on cosmological scales. This is because the gauge field evolves exponentially during inflation while in order to generate appreciable anisotropies at the end of inflation the spectator gauge field has to be frozen and scale invariant. We argue that this is a generic feature, that is, one can not generate observable anisotropies at the end of inflation within an FRW background.

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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