What is the difference between Quantum Physics, Quantum …
Quantum field theory (QFT) is a theoretical framework for constructing quantum mechanical models of subatomic particles in particle physics and quasiparticles in condensed matter physics, by treating a particle as an excited state of an underlying physical field.
What is a complete book for introductory quantum field theory?
Peskin and Schroeder's An Introduction To Quantum Field Theory ; There is a list by Luboš Motl here; Mark Srendnick's Quantum Field Theory; Folland's Quantum field theory; These are recommendations from the older answers that did not follow the book policy. Plain recommendations are inappropriate now, try to explain what the book covers, its ...
quantum field theory - Mathematically rigorous QFT text - Physics …
2021年10月23日 · 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-Axioms". There are also many good books about that approach. Examples are. H. Araki: Mathematical Theory of Quantum Fields, Oxford Science Publications, 1999.
Ether vs. Quantum Field Theory - Physics Stack Exchange
2017年1月30日 · 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 existing at (x, y, z, t)), manifested by creation and annihilation operators acting on the electron field, and the expectation value defines the location of the electron as a function of ...
quantum field theory - Online QFT video lectures - Physics Stack …
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, Representation theory of the Poincaré group; 3, The free scalar field; 4, The free Dirac field 5, Interacting field theories; 6, Supersymmetry; 7, S ...
Unitary quantum field theory - Physics Stack Exchange
$\begingroup$ In a quantum theory (quantum mechanics or quantum field theory), unitarity means conservation of probability (or conservation of information), that is, if a state $|\psi>$ evolves in a state $|\psi'>$, you will have $<\psi|\psi> = <\psi'|\psi'>$. This means that the operator which transforms $|\psi>$ into $|\psi'>$ must be unitary.
quantum field theory - How are bound states handled in QFT?
2015年11月10日 · The conventional way to handle bound states in relativistic quantum field theory is the Bethe-Salpeter equation. An old but very informative survey paper on the Bethe-Salpeter equation is. M.M. Broido, Green functions in particle physics, Reports on Progress in Physics 32 (1969), 493-545.
quantum field theory - Commutation relations in QFT and the …
As such, the correct definition for causality in quantum field theory is $$ \left[\phi(f),\varphi(g)\right]=0\qquad\mathcal{D}(f)\cap\mathcal{D}(g)=\textrm{space-like}. $$ If you calculate the above in some simple cases, for example for the free Klein-Gordon field (or Dirac) you will see that the right hand side will produce a result which ...
quantum field theory - Legendre transformation in QFT - Physics …
2020年4月12日 · It seems that OP's counterexamples come from the family of ${\cal N}=2$ SUSY field theories in 4D, cf. Refs. 1 & 2. Such theories are typically defined via (i) a twisted compactification of a 6D (2,0) SCFT (so-called class ${\cal S}$), or (ii) a field theory limit of string theory on a Calabi-Yau singularity (aka. geometric engineering).
What is quantum field theory? | New Scientist
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