Yes, Feynman's Lectures on Physics can be beneficial for PhD students in theoretical high energy physics. Feynman's lectures are highly regarded for their clarity, insight, and pedagogical approach to physics. While they were originally intended as undergraduate-level material, many advanced students and even researchers find value in studying them.
Feynman covers a wide range of topics in his lectures, including classical mechanics, electromagnetism, quantum mechanics, statistical mechanics, and quantum field theory. These subjects form the foundation of theoretical physics and are essential for understanding high energy physics.
Even though Feynman's lectures were delivered several decades ago, the fundamental principles and concepts he presents remain relevant today. The lectures provide a solid grounding in the core principles of physics, helping students develop a strong conceptual understanding and intuition.
While Feynman's lectures alone may not cover all the advanced topics specific to high energy physics, they can serve as an excellent supplement to the material covered in formal coursework and textbooks. They offer a unique perspective and often provide intuitive explanations that can deepen one's understanding of complex concepts.
PhD students in theoretical high energy physics often find value in exploring multiple sources, including textbooks, research papers, and lecture notes, to gain a comprehensive understanding of their field. Feynman's Lectures on Physics can be a valuable addition to this collection, providing additional insights and explanations that can aid in the learning process.