Random lecture notes.
The folder ICG_PhD_Lectures_Theoretical_Cosmology_2016 contains lecture notes and slides for the PhD lectures on theoretical cosmology in 2016. These are written by Kazuya Koyama, Vincent Vennin and David Wands.
The 2017 and 2018 lectures on theoretical cosmology were given by Hans Winther, Emir Gumrukcuoglu and Matteo Fasiello. Emir's dark energy lectures are in darkenergy1-1-AEG.pdf and darkenergy1-2-AEG.pdf. My lectures, partly based on the notes above, on theoretical cosmology are found in Theoretical_Cosmology_Lecture_1.pdf (introduction to theoretical cosmology) and Theoretical_Cosmology_Lecture_2.pdf (the big bang model and the theremal history of the Universe).