This book introduces quantum field theory, together with its most important applications to cosmology and astroparticle physics, in a coherent framework. The path integral approach is employed right from the start, and the use of Green functions and generating functionals is illustrated first in quantum mechanics and then in scalar field theory. Massless spin one and two fields are discussed on an equal footing, and gravity is presented as a gauge theory in close
analogy with the Yang-Mills case. Concepts relevant to modern research such as helicity methods, effective theories, decoupling, or the stability of the electroweak vacuum are introduced. Various applications such as topological defects, dark matter, baryogenesis, processes in external gravitational
fields, inflation and black holes help students to bridge the gap between undergraduate courses and the research literature.
Michael Kachelriess is Professor of Physics at the Norwegian University of Science and Technology in Trondheim. After receiving his PhD from Ruhr University at Bochum in 1996, he held fellowships at Gran Sasso National Laboratory, the University of Valencia, the Theory Division of CERN, and the Max Planck Institute for Physics in Munich. His research focuses on theoretical astroparticle physics, and he has published widely in this field.