论文标题

宇宙学和天体物理学中轴突样颗粒的现象学方面

Phenomenological Aspects of Axion-Like Particles in Cosmology and Astrophysics

论文作者

Ayad, Ahmed

论文摘要

宇宙学和粒子物理今天比以往任何时候都更加接近,在宇宙学,粒子物理和田间理论之间进行了几次搜索。暗物质(DM)的奥秘是这些领域之间最大的常见未解决问题之一。它是基于许多天体物理和宇宙学观察的建立,即宇宙的总物质的一小部分是由男性物质制成的,而绝大多数是由暗物质组成的。但是,这种组件的性质仍然未知。理论上有充分动机的方法来理解暗物质的性质,就是通过寻找诸如轴和类似轴的颗粒(ALP)的暗物质的光伪量表候选者。轴是由Peccei-Quinn(PQ)溶液引起的假设基本颗粒,用于量子染色体动力学(QCD)中强的CP(电荷 - 差异)问题。此外,许多理论上对标准粒子物理(SMPP)模型的良好动机扩展预测了与QCD轴相似的更多伪量表粒子的存在,称为ALPS。轴和阿尔卑斯山的特征是它们与两个光子耦合。尽管轴的耦合参数与轴突质量有关,但耦合参数与阿尔卑斯山的质量之间没有直接关系。然而,可以预期阿尔卑斯山共享相同的斧头现象学。在过去的几年中,斧头和阿尔卑斯山恢复了受欢迎程度,并逐渐成为可能有助于宇宙暗物质密度的最吸引人的候选人之一。在本文中,我们专注于研究轴和阿尔卑斯山相互作用与光子的现象学,以限制其某些特性。

Cosmology and particle physics are closer today than ever before, with several searches underway at the interface between cosmology, particle physics, and field theory. The mystery of dark matter (DM) is one of the greatest common unsolved problems between these fields. It is established now based on many astrophysical and cosmological observations that only a small fraction of the total matter content of the universe is made of baryonic matter, while the vast majority is constituted by dark matter. However, the nature of such a component is still unknown. One theoretically well-motivated approach to understanding the nature of dark matter would be through looking for light pseudo-scalar candidates for dark matter such as axions and axion-like particles (ALPs). Axions are hypothetical elementary particles resulting from the Peccei-Quinn (PQ) solution to the strong CP (charge-parity) problem in quantum chromodynamics (QCD). Furthermore, many theoretically well-motivated extensions to the standard model of particle physics (SMPP) predicted the existence of more pseudo-scalar particles similar to the QCD axion and called ALPs. Axions and ALPs are characterized by their coupling with two photons. While the coupling parameter for axions is related to the axion mass, there is no direct relation between the coupling parameter and the mass of ALPs. Nevertheless, it is expected that ALPs share the same phenomenology of axions. In the past years, axions and ALPs regained popularity and slowly became one of the most appealing candidates that possibly contribute to the dark matter density of the universe. In this thesis, we focus on studying the phenomenology of axions and ALPs interactions with photons to constrain some of their properties.

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