quantum field theory

American  

[kwon-tuhm feeld thee-uh-ree, theer-ee] / ˈkwɒn təm ˈfild ˌθi ə ri, ˌθɪər i /

noun

Physics.

1. any field theory that applies the principles and methodology of quantum mechanics. QFT

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quantum field theory British  

noun

1. physics quantum mechanical theory concerned with elementary particles, which are represented by fields whose normal modes of oscillation are quantized

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quantum field theory Scientific  

1. The application of quantum mechanics to physical systems described by fields, such as electromagnetic fields. Quantum field theory was developed to overcome certain deficiencies in Schrödinger's equation, in particular the fact that it was not consistent with special relativity and was difficult to apply to systems involving many particles or to the creation and destruction of particles.

2. See also quantum chromodynamics quantum electrodynamics

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Etymology

Origin of quantum field theory

First recorded in 1945–50

Example Sentences

In 1999, Neves Valente took an optional class in quantum field theory and earned a near-perfect grade of 19 out of 20, professor Jorge Romão said after reviewing old paperwork.

From The Wall Street Journal • Dec. 20, 2025

In quantum field theory, when a not-so-stable state transforms into the true stable state, it's called "false vacuum decay."

From Science Daily • Jan. 22, 2024

In the Caltech interview, he recalled a paper in which he suggested that gravity could solve some troubling infinities that were showing up in the quantum field theory of electrodynamics.

From New York Times • May 8, 2023

“Sebens is very much on the right track, or at least doing something very, very useful in the sense that he’s taking the field-ness of quantum field theory very seriously.”

From Scientific American • Nov. 22, 2022

“I don’t expect someone in middle school to walk into a quantum field theory class and understand tensor math, right?”

From Science Magazine • Oct. 4, 2022