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In theoretical physics, quantum field theory (QFT) is a theoretical framework that combines field theory and the principle of relativity with ideas behind quantum mechanics. [ 1 ] : xi QFT is used in particle physics to construct physical models of subatomic particles and in condensed matter physics to construct models of quasiparticles .
Quantum field theory originated in the 1920s from the problem of creating a quantum mechanical theory of the electromagnetic field.In particular, de Broglie in 1924 introduced the idea of a wave description of elementary systems in the following way: "we proceed in this work from the assumption of the existence of a certain periodic phenomenon of a yet to be determined character, which is to ...
Stephen Barr said about the book, "Like the famous Feynman Lectures on Physics, this book has the flavor of a good blackboard lecture". [3] Michael Peskin's review in Classical and Quantum Gravity said, "This is quantum field theory taught at the knee of an eccentric uncle; one who loves the grandeur of his subject, has a keen eye for a slick argument, and is eager to share his repertoire of ...
In mathematical physics, constructive quantum field theory is the field devoted to showing that quantum field theory can be defined in terms of precise mathematical structures. This demonstration requires new mathematics , in a sense analogous to classical real analysis , putting calculus on a mathematically rigorous foundation.
He is a Donald Biggar Willett Professor of Physics at the University of Illinois at Urbana–Champaign, where he is the director of the Institute for Condensed Matter Theory, [3] and is the author of the books Quantum Field Theory: An Integrated Approach and Field Theories of Condensed Matter Physics. [4] [5]
A qubit field theory is a quantum field theory in which the canonical commutation relations involved in the quantisation of pairs of observables are relaxed. Specifically, it is a quantum field theory in which, unlike most other quantum field theories, the pair of observables is not required to always commute. [1]
John Cardy in 1988 considered the possibility to generalise C-theorem to higher-dimensional quantum field theory.He conjectured [2] that in four spacetime dimensions, the quantity behaving monotonically under renormalization group flows, and thus playing the role analogous to the central charge c in two dimensions, is a certain anomaly coefficient which came to be denoted as a.
Dmitry Vasil'evich Shirkov (Russian: Дми́трий Васи́льевич Ширко́в; 3 March 1928 – 23 January 2016) was a Russian theoretical physicist, known for his contribution to quantum field theory and to the development of the renormalization group method.