It is the only existing Abstract: Quantum field theory has undergone extraordinary developments in the last few ades and permeates many branches of modern research such as particle physics, Michele Maggiore: Gravitational waves. D ́epartement de Physique Th ́eorique, Universit ́e de Gen`, quai Ansermet, Gen` eve, Switzerland The aim of this book is to become a major reference text for gravitational-wave physics, covering in detail both the experimental and the theoretical aspects. This first v