humanino said:While there are many (many...) people who use QFT from high energy to solid state physics, there are only few people who work on QFT per se. Are you interested in the mathematical formalism itself, or applying it to a physical problem ?
Quantum Field Theory (QFT) is a theoretical framework used to describe the interactions between particles at a quantum level. It combines the principles of quantum mechanics and special relativity to explain the behavior of matter and energy at a subatomic level.
QFT has been used in a variety of fields, including particle physics, condensed matter physics, and cosmology. It has helped in the development of technologies such as transistors, lasers, and superconductors, and has also been used to study the early universe and the behavior of black holes.
QFT is a complex and advanced subject, typically studied at the graduate level in universities. Many top universities around the world offer courses and research opportunities in QFT, including MIT, Harvard, and Cambridge. Online resources such as MIT OpenCourseWare and Coursera also offer introductory courses in QFT.
A solid understanding of classical mechanics, electrodynamics, and quantum mechanics is necessary to study QFT. Additionally, a strong foundation in mathematics, including calculus, linear algebra, and differential equations, is crucial for understanding the mathematical concepts in QFT.
Some recommended textbooks for learning QFT include "Quantum Field Theory for the Gifted Amateur" by Tom Lancaster and Stephen J. Blundell, "Quantum Field Theory" by Mark Srednicki, and "Quantum Field Theory and the Standard Model" by Matthew D. Schwartz. Online resources such as the Stanford Encyclopedia of Philosophy and the Perimeter Institute's Quantum Field Theory Primer are also helpful for understanding the concepts and principles of QFT.