# The Bridge Between Math and Quantum Field Theory

#### What is Quantum Field Theory ?

In **theoretical physics**, **quantum field theory** (QFT) is a theoretical framework that combines classical field theory, **special relativity** and **quantum mechanics**. xi **QFT** is used in **particle physics** to construct physical **models of subatomic particles** and in condensed matter physics to construct models of quasiparticles.

**QFT** treats particles as excited states (also called quanta) of their **underlying quantum fields**, which are more fundamental than the particles. Interactions between particles are described by interaction terms in the Lagrangian involving their corresponding **quantum fields**. Each interaction can be visually represented by Feynman **diagrams according** to perturbation **theory in quantum mechanics**.

Even in an incomplete state, **quantum field theory** is the most successful **physical theory** ever discovered. Nathan Seiberg, one of its leading architects, reveals where math and QFT converge.

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