This book provides a largely self-contained and broadly accessible exposition on two
cosmological applications of algebraic quantum field theory (QFT) in curved spacetime: a
fundamental analysis of the cosmological evolution according to the Standard Model of Cosmology
and a fundamental study of the perturbations in inflation. The two central sections of the book
dealing with these applications are preceded by sections providing a pedagogical introduction
to the subject. Introductory material on the construction of linear QFTs on general curved
spacetimes with and without gauge symmetry in the algebraic approach physically meaningful
quantum states on general curved spacetimes and the backreaction of quantum fields in curved
spacetimes via the semiclassical Einstein equation is also given. The reader should have a
basic understanding of General Relativity and QFT on Minkowski spacetime but no background in
QFT on curved spacetimes or the algebraic approach to QFT is required.>
