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arXiv 1102.1390hep-thastro-ph.COgr-qchep-ph
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带中间级的保形滚转方案中的标量扰动

Scalar perturbations in conformal rolling scenario with intermediate stage

M. Libanov, S. Ramazanov, V. Rubakov

摘要:

功率谱近似平坦的标量宇宙学扰动可能来源于与引力共形耦合的标量场的相位扰动和负四次势的滚降。我们考虑一个版本的这种情况下,其特定的属性是一个漫长的中间阶段之间的共形滚动和地平线出口的相位扰动的结束。这样的阶段是自然的,例如,在宇宙学中有着重要的意义它的存在导致小的负标量倾斜,从一般结构的四极开始的所有偶多极子的统计各向异性(与通常讨论的特殊类型的单个四极子相反)和特殊形式的非高斯性。

英文摘要:

Scalar cosmological perturbations with nearly flat power spectrum may originate from perturbations of the phase of a scalar field conformally coupled to gravity and rolling down negative quartic potential. We consider a version of this scenario whose specific property is a long intermediate stage between the end of conformal rolling and horizon exit of the phase perturbations. Such a stage is natural, e.g., in cosmologies with ekpyrosis or genesis. Its existence results in small negative scalar tilt, statistical anisotropy of all even multipoles starting from quardupole of general structure (in contrast to the usually discussed single quadrupole of special type) and non-Gaussianity of a peculiar form.

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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