论文标题
宇宙学中的观察力：三种天文学观点
Observables In Cosmology: Three Astronomical Perspectives
论文作者
论文摘要
在本文中，我介绍了我在M博士学位期间进行的三个项目。在第一个项目中，我引入了共形转换和银河系县。我明确地表明，星系数计数在共形转换下是不变的，这使其成为一个很好的物理观察。在第二个项目中，我研究了镜头弱（尤其是宇宙剪切）如何影响星系图像的形状。我表明，如果还测量了光偏振，则可以观察到椭圆形星系形状的主轴的旋转将成为一种宇宙学。我展示了如何用于估计宇宙剪切及其相关功能。在第三个项目中，我定义了拉格朗日重力理论的更高阶段（Riemann squared and -cubed）。我计算了该理论中引力波的速度和准频率的线性校正。
In this thesis, I present three projects I carried out during m PhD. In the first project, I introduce Conformal Transformations and the Galaxy Number County. I explicitly show that the Galaxy Number Counts is invariant under Conformal Transformations, which makes it a good physical observable. In the second project, I study how weak lensing, and in particular cosmic shear, affects the shape of the galaxy images. I show that, if the light polarisation is also measured, the rotation of the main axes of the elliptical galaxy shape becomes a cosmological observable. I show how this can be used to estimate cosmic shear and its correlation functions. In the third project, I define a higher order (Riemann-squared and -cubed) Lagrangian Effective Theory of Gravity. I compute the linear correction to the speed and the quasinormal frequencies of the gravitational waves in this theory around a Schwarzschild-like background.
