arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.09720astro-ph.COgr-qc
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引力涨落作为暴胀的替代方案III。数值结果

Gravitational Fluctuations as an Alternative to Inflation III. Numerical Results

Herbert W. Hamber, Lu Heng Sunny Yu, Hasitha E. Pituwala Kankanamge

摘要:

功率谱在暴胀理论中起着重要的作用,它们能够高精度地再现当前的观测数据,通常被认为是暴胀的胜利,这主要是因为缺乏可靠的替代品。在以前的工作中,我们介绍了另一种图片的宇宙学功率谱的基础上的非微扰功能的量子版本的爱因斯坦的引力,而不是目前流行的通货膨胀模型的基础上标量场。这幅新图像的关键成分是一个非平凡的引力真空凝聚体的出现(与观测到的宇宙学常数直接相关),以及一个可计算的重整化群在宇宙学尺度上运行的牛顿G。以前获得的结果主要是基于半分析的治疗,往往受到各种近似和简化假设的限制。在这项工作中,我们扩展和完善我们以前的计算,通过布局更新和扩展的分析,现在利用一组适当修改的国家的最先进的数值程序(ISiTGR,MGCAMB和MGCLASS)开发的观测宇宙学。因此,我们能够删除我们以前的研究中使用的一些近似,从而产生一些新颖而详细的物理预测。这些应该有助于潜在地区分量子引力的真空凝聚图像与其他模型,如标量场膨胀。在这里,除了物质功率谱P(k)之外,我们还详细预测了被称为TT,TE,EE,BB角谱以及它们密切相关的透镜谱。然而,目前有限的观测数据精度(特别是在大角度尺度上)还不允许我们清楚地证明或反驳任何一组想法。

英文摘要:

Power spectra play an important role in the theory of inflation, and their ability to reproduce current observational data to high accuracy is often considered a triumph of inflation, largely because of a lack of credible alternatives. In previous work we introduced an alternative picture for the cosmological power spectra based on the nonperturbative features of the quantum version of Einstein's gravity, instead of currently popular inflation models based on scalar fields. The key ingredients in this new picture are the appearance of a nontrivial gravitational vacuum condensate (directly related to the observed cosmological constant), and a calculable renormalization group running of Newton's G on cosmological scales. Results obtained previously were largely based on a semi-analytical treatment, and often suffered from the limitations of various approximations and simplifying assumptions. In this work, we extend and refine our previous calculations by laying out an updated and extended analysis, which now utilizes a set of suitably modified state-of-the-art numerical programs (ISiTGR, MGCAMB and MGCLASS) developed for observational cosmology. As a result, we are able to remove some of the approximations employed in our previous studies, leading to a number of novel and detailed physical predictions. These should help in potentially distinguish the vacuum condensate picture of quantum gravity from that of other models such as scalar field inflation. Here, besides the matter power spectrum P(k), we work out in detail predictions for what are referred to as the TT, TE, EE, BB angular spectra, as well as their closely related lensing spectra. However, the current limited precision of observational data today (especially on large angular scales) does not allow us yet to clearly prove or disprove either set of ideas.

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