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What is quantum field theory? - New Scientist 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
How many quantum fields are there? - Physics Stack Exchange $\begingroup$ You can't that simply count quantum fields If there is Lorentz invariance, it may seem natural to count Lorentz multiplets (like the different polarizations of the electron) as one But then if you believe in supersymmetry you'll have to group more If you believe in string theory there's only one master field
What are quantum fields made up of? - Physics Stack Exchange Quantum fields are mathematical constructs that represent quantum degrees of freedom In relativistic quantum field theory, a quantum field can be used to represent an indefinite number of identical relativistic particles Furthermore, quantum fields allow us to encode interactions that are local
Energy and properties in quantum fields - Physics Stack Exchange This state of space is distinct from the space of possible configurations of the fields, that is, in quantum field theory, the fields do not encode the state of the world This is crucial, and why statements like "the energy is in the field" make sense classically (because the field really is what we encode a state with a certain energy in
From discrete to continuous - why quantum *fields*? I read the link you gave - I think the difficulty I find is that most courses introduce quantum fields, their corresponding free theory and then moves onto interactions and introduces the S-matrix However, Weinberg explicitly uses the notion of an S-matrix to argue that one must use quantum fields?! $\endgroup$ –
What are quantum fields mathematically? - Physics Stack Exchange The definition of a quantum field depends slightly on the formalism that you adopt, but globally, quantum fields are defined as operator-valued distributions That is, if you have a quantum field $\Phi$, it is defined as
What exactly is a quantum field? - Physics Stack Exchange It turns out that the easiest way to accomplish this is by first building quantum fields and using the quantum fields to build ${\cal H}(t,\mathbf{x})$ Finally one realizes that it is even possible to bypass the manual construction of ${\cal H}(t,\mathbf{x})$ from quantum fields if one starts with a classical field theory and quantizes
education - What is a quantum field? - Physics Stack Exchange Yet quantum fields are always represented as just single terms; an example, the Feynman Rules a fermionic field is: ψ(xi) How is such a complex sounding system of fock spaces and Quantum harmonic oscillator be contained in just one single term? $\endgroup$