O que se estuda na teoria quântica de campos?

Clique na foto da capa e vá passando as páginas para ver o índice (os três primeiros são a melhor coleção):
https://www.amazon.com/Quantum-Theory-Fields-Foundations/dp/0521670535/ref=sr_1_1?s=books&ie=UTF8&qid=1484010885&sr=1-1&keywords=quantum+theory+of+fields
https://www.amazon.com/Quantum-Theory-Fields-Modern-Applications/dp/0521670543/ref=sr_1_2?s=books&ie=UTF8&qid=1484010885&sr=1-2&keywords=quantum+theory+of+fields
https://www.amazon.com/Quantum-Theory-Fields-Supersymmetry/dp/0521660009/ref=sr_1_3?s=books&ie=UTF8&qid=1484010885&sr=1-3&keywords=quantum+theory+of+fields
https://www.amazon.com/Quantum-Field-Theory-Mark-Srednicki/dp/0521864496/ref=sr_1_4?s=books&ie=UTF8&qid=1484010885&sr=1-4&keywords=quantum+theory+of+fields