Certainly! If you're looking to explore theoretical physics beyond Feynman's lectures and delve into topics such as quantum field theory and string theory, here are some recommended books:
"Quantum Field Theory in a Nutshell" by A. Zee: This book provides a comprehensive introduction to quantum field theory, covering topics such as the path integral formulation, renormalization, gauge theory, and the standard model of particle physics. It offers a clear and concise presentation, suitable for both beginners and advanced readers.
"An Introduction to Quantum Field Theory" by Michael E. Peskin and Daniel V. Schroeder: This book is widely used as a textbook for graduate courses in quantum field theory. It covers the basic principles of field theory, including the quantization of fields, renormalization, and the study of symmetries. It also provides an introduction to the standard model and the renormalization group.
"String Theory, Vol. 1 and 2" by Joseph Polchinski: This two-volume set is a comprehensive guide to string theory. It covers various aspects of the subject, including classical dynamics of strings, conformal field theory, D-branes, supersymmetry, and the AdS/CFT correspondence. The books are highly regarded for their clarity and depth.
"Quantum Field Theory for the Gifted Amateur" by Tom Lancaster and Stephen J. Blundell: If you're looking for a more accessible introduction to quantum field theory, this book is an excellent choice. It covers the fundamental concepts and techniques of field theory, including Feynman diagrams, the path integral formulation, and renormalization, with an emphasis on intuitive explanations and practical calculations.
"The Road to Reality: A Complete Guide to the Laws of the Universe" by Roger Penrose: Although not specifically focused on quantum field theory or string theory, this book offers a comprehensive overview of modern physics. It covers a wide range of topics, including classical mechanics, general relativity, quantum mechanics, and cosmology. It provides a deep understanding of the underlying principles of physics.
These books should provide you with a solid foundation and a deeper exploration of theoretical physics, beyond what was covered in Feynman's lectures. Remember that these topics can be quite advanced, so it's beneficial to have some background in physics and mathematics before diving into them.