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arXiv 1003.1283astro-ph.COgr-qchep-phhep-th
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Einstein-Aether和BPSH理论中的原始微扰

Primordial Perturbations in Einstein-Aether and BPSH Theories

Cristian Armendariz-Picon, Noela Farina Sierra, Jaume Garriga

摘要:

本文研究了爱因斯坦以太理论中单场暴胀阶段产生的原初微扰。暴胀子和以太场的量子涨落产生长波长绝热和等曲率标量扰动,以及横向矢量扰动。在几何上,等曲率模式是以太相对于物质的速度场的势。在一定的参数范围内,这种模式可能会导致可观测宇宙中以太的相当大的随机速度。绝热模式对应于共同运动切片(物质处于静止状态)的曲率扰动。与标准情况相比,它在大尺度上具有非零的各向异性应力。标量和矢量扰动可能在宇宙微波背景上留下重要的印记。我们计算它们的原始光谱,分析它们对温度各向异性的贡献,并制定一些从观测中得出的唯象约束。这些可以用来进一步收紧这类理论的参数的现有限制。标量扇区的结果也适用于Blas,Pujolas和Sibiriakov最近提出的Horava引力的扩展。

英文摘要:

We study the primordial perturbations generated during a stage of single-field inflation in Einstein-aether theories. Quantum fluctuations of the inflaton and aether fields seed long wavelength adiabatic and isocurvature scalar perturbations, as well as transverse vector perturbations. Geometrically, the isocurvature mode is the potential for the velocity field of the aether with respect to matter. For a certain range of parameters, this mode may lead to a sizable random velocity of the aether within the observable universe. The adiabatic mode corresponds to curvature perturbations of co-moving slices (where matter is at rest). In contrast with the standard case, it has a non-vanishing anisotropic stress on large scales. Scalar and vector perturbations may leave significant imprints on the cosmic microwave background. We calculate their primordial spectra, analyze their contributions to the temperature anisotropies, and formulate some of the phenomenological constraints that follow from observations. These may be used to further tighten the existing limits on the parameters for this class of theories. The results for the scalar sector also apply to the extension of Horava gravity recently proposed by Blas, Pujolas and Sibiriakov.

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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