Quantum: The Quantum Theory of Particles, Fields, and Cosmology is a comprehensive textbook that explores the quantum theory of particles, fields, and the universe as a whole. Written by physicist and author Steven Weinberg, this book provides a detailed and authoritative overview of quantum field theory and its applications. It covers topics such as quantum electrodynamics, quantum chromodynamics, and the quantum theory of gravity. With its mathematical rigor and insightful explanations, this book is a must-read for anyone interested in the frontiers of theoretical physics.