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arXiv 1306.5736astro-ph.COhep-phhep-th
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来自快速滚动相位的CMB偶极子不对称性

CMB dipole asymmetry from a fast roll phase

Anupam Mazumdar, Lingfei Wang

摘要:

观测到的宇宙微波背景偶极不对称性不能用单一的暴胀场模型来解释--它不可避免地需要不止一个场,其中一个场负责放大超哈勃涨落,使其超出枢轴尺度。此外,对$f_NL$和$tau_NL$的当前约束要求这种放大不能产生大的非高斯性。在本文中,我们提出了一个模型来解释这种偶极不对称性从观众场,这是负责产生所有的曲率扰动,但有一个临时的快速滚动阶段之前,哈勃退出枢轴尺度。目前的数据更喜欢旁观者的情况下,因为它没有留下等曲率扰动。旁观者模型也将满足由类星体引起的众所周知的约束,以及CMB的四极和八极。

英文摘要:

The observed CMB (cosmic microwave background) dipole asymmetry cannot be explained by a single field model of inflation - it inevitably requires more than one field where one of the fields is responsible for amplifying the super-Hubble fluctuations beyond the pivot scale. Furthermore the current constraints on $f_NL$ and $tau_NL$ require that such an amplification cannot produce large non-Gaussianity. In this paper we propose a model to explain this dipole asymmetry from a spectator field, which is responsible for generating all the curvature perturbations, but has a temporary fast roll phase before the Hubble exit of the pivot scale. The current data prefers spectator scenario because it leaves no isocurvature perturbations. The spectator model will also satisfy the well-known constraints arising from quasars, and the quadrupole and octupole of the CMB.

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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