Quantum: The Quantum Theory of Particles, Fields, and Cosmology is a comprehensive textbook that covers the principles of quantum theory in the context of particle physics, field theory, and cosmology. Authored by renowned physicist and Nobel laureate Manfred Requardt, this book provides a detailed and rigorous treatment of quantum mechanics, quantum field theory, and their applications in modern physics. With its mathematical rigor and in-depth explanations, this book is an invaluable resource for students and researchers in the field of quantum physics.