arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1907.08010astro-ph.COgr-qchep-ph
收藏

中微子质量标度和质量序的宇宙学研究

Cosmological searches for the neutrino mass scale and mass ordering

Sunny Vagnozzi

摘要:

在这篇论文中,我从三个方面描述了中微子宇宙学最近的一些重要进展。首先,集中在大尺度结构(LSS)的数据,我将表明,目前的宇宙学探测包含了丰富的信息的总和中微子质量。我报告的分析导致目前最好的上限总和中微子质量的$0.12\,{\rm eV}$。我展示了如何宇宙学数据表现出弱偏好正常中微子质量排序,因为参数空间体积效应,并提出了一个简单的方法来量化这种偏好。其次,我将讨论星系偏差如何严重限制充分利用LSS数据中隐藏的中微子信息。我提出了一种方法来校准的尺度依赖的星系偏差使用CMB透镜星系互相关。此外,在存在大质量中微子的情况下,通常的偏置定义变得不合适,因为它导致了对大尺度的尺度依赖性,而这种依赖性从未被解释过。我表明,未能适当地定义的偏见将是一个问题,为未来的LSS调查,并提出了一个简单的配方来解释大规模中微子对星系的偏见。最后,我讨论了中微子参数和其他宇宙学参数之间的相关性的含义。在非幻影动力学暗能量模型中,中微子质量总和的上限比$Λ$ CDM极限更严格。因此,这样的模型表现出更强的偏好正常的顺序,和他们的生存能力可能会受到危害,如果不久的将来的实验室实验确定,质量排序是颠倒的。然后,我讨论中微子和暴胀参数之间的相关性。我发现我们对暴胀参数的确定与中微子扇区的假设相比是稳定的。(节略)

英文摘要:

In this thesis, I describe a number of recent important developments in neutrino cosmology on three fronts. Firstly, focusing on Large-Scale Structure (LSS) data, I will show that current cosmological probes contain a wealth of information on the sum of the neutrino masses. I report on the analysis leading to the currently best upper limit on the sum of the neutrino masses of $0.12\,{\rm eV}$. I show how cosmological data exhibits a weak preference for the normal neutrino mass ordering because of parameter space volume effects, and propose a simple method to quantify this preference. Secondly, I will discuss how galaxy bias represents a severe limitation towards fully capitalizing on the neutrino information hidden in LSS data. I propose a method for calibrating the scale-dependent galaxy bias using CMB lensing-galaxy cross-correlations. Moreover, in the presence of massive neutrinos, the usual definition of bias becomes inadequate, as it leads to a scale-dependence on large scales which has never been accounted for. I show that failure to define the bias appropriately will be a problem for future LSS surveys, and propose a simple recipe to account for the effect of massive neutrinos on galaxy bias. Finally, I discuss implications of correlations between neutrino parameters and other cosmological parameters. In non-phantom dynamical dark energy models, the upper limit on the sum of the neutrino masses becomes tighter than the $Λ$CDM limit. Therefore, such models exhibit an even stronger preference for the normal ordering, and their viability could be jeopardized should near-future laboratory experiments determine that the mass ordering is inverted. I then discuss correlations between neutrino and inflationary parameters. I find that our determination of inflationary parameters is stable against assumptions about the neutrino sector. (abridged)

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。

↑