The topic of the CVIII session of the Ecole de Physique des Houches, held in July 2017, was Effective Field Theory in Particle Physics and Cosmology. Effective Field Theory (EFT) is a general method for describing quantum systems with multiple length scales in a tractable fashion. It allows to perform precise calculations in established models (such as the Standard Models of particle physics and cosmology), as well as to concisely parametrise possible effects from physics beyond the Standard Models.

The goal of this school was to offer a broad introduction to the foundations and modern applications of Effective Field Theory in many of its incarnations. This is all the more important as there are preciously few textbooks covering the subject, none of them in a complete way. In this book, the lecturers present the concepts in a pedagogical way so that readers can adapt some of the latest developments to their own problems. The chapters cover almost all the lectures given at the school and will serve as an introduction to the topic and as a reference manual to students and researchers.

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Sacha Davidson is CNRS Researcher in Astroparticle Physics at Laboratoire del'Univers et des Particules de Montpellier, Montpellier, France.

Paolo Gambino is Professor of Theoretical Physics at the National Institute of Nuclear Physics, University of Turin, Torino, Italy.

Mikko Laine is Professor of Theoretical Physics at the Albert Einstein Centre, Institute for Theoretical Physics, University of Bern, Switzerland.

Matthias Neubert is Director of the Mainz Institute for Theoretical Physics and Professor of Theoretical Physics at Johannes Gutenberg University Mainz, Germany.

Christophe Salomon is Research Director at CNRS at the Laboratoire Kastler Brossel, Ecole Normale Superieure, Paris, France.