Quantum field theory marries the ideas of other quantum theories to depict all particles as “excitations” that arise in underlying fields. The British physicist Paul Dirac started the ball ...

Quantum field theory (QFT) is a theoretical framework for constructing quantum mechanical models of subatomic particles in particle physics and quasiparticles in condensed matter …

Oct 23, 2021 · A modern approach to quantum field theory, which axiomatizes the assignment of algebras of observables, is "Algebraic Quantum Field Theory", based on the "Haag-Kastler …

Feb 24, 2023 · Alright so I think that yes one may be able to consider the Feynman formalism and worldline QFT as equivalent just due to the fact that any Feynman diagram can be constructed …

Aug 21, 2023 · Just as the QM wavefunction accomodates all qs, just so the QFT wavefunctional encompasses all classical field functions $\phi(x)$, eigenvalues of the field operator. There are …

Dec 29, 2015 · "Quantum field theory for the gifted amateur" by Lancaster and Blundell is good. It would be good for you to know some basic calculus: integration, differentiation, Fourier …

Abstract: The lectures are intended to provide an introduction to Quantum Field Theory at an elementary level. In particular, the following topics will be treated: 1, Basic principle of QFT; 2, …

Quantum field theory is a theory that describes the critical point and the neighbor of the critical point of a lattice model. (Lattice models do have a rigorous definition). So to rigorously define …

Jan 30, 2017 · In quantum field theory an electron traversing space time is described by a quantum mechanical wave packet (which means that what "waves" is the probability of …

Dec 1, 2018 · It is a specialization of quantum theory (it respects all of the principles of quantum theory and includes some more), but it is still very broad. QED is a further specialization. QED …