What is quantum field theory?

Quantum field theory marries the ideas of other quantum theories to depict all particles as “excitations” that arise in underlying fields.

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Quantum field theory, Definition & Facts

Quantum gravity - Wikipedia

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A Prelude to Quantum Field Theory

Quantum Field Theory and the Unity of God., Shlomo Ezagui

Gravity and Electric Charges: Attraction and Repulsion

Foundations of Quantum Field Theory: 2019 Annual Philosophy of Physics Conference - The Rotman Institute of Philosophy

perturbative quantum field theory in nLab

An Introduction To Quantum Field Theory by Michael E. Peskin