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There is a page named "Functional integral (QFT)" on Wikipedia
- configurations. Much of the formal study of QFT is devoted to the properties of the resulting functional integral, and much effort (not yet entirely successful)...86 KB (14,263 words) - 07:24, 11 August 2024
- by physicists when using the Feynman path integral formalism in quantum field theory (QFT), uses a functional integration: det S ∝ ( ∫ V D ϕ e − ⟨ ϕ ,...15 KB (2,715 words) - 20:36, 27 May 2024
- Quantum field theory (section Path integrals)field theory (QFT) is a theoretical framework that combines classical field theory, special relativity, and quantum mechanics.: xi QFT is used in particle...106 KB (14,897 words) - 17:13, 18 August 2024
- "physical" asymptotic states when performing QFT calculations. Crucially, this symmetry of the path integral is preserved in loop order, and thus prevents...55 KB (8,743 words) - 07:00, 28 May 2024
- function in QED. In the path integral formulation, the Ward–Takahashi identities are a reflection of the invariance of the functional measure under a gauge transformation...10 KB (1,658 words) - 09:14, 2 June 2024
- polynomially bounded functional F {\displaystyle F} over the field configurations, then, for any state vector (which is a solution of the QFT), | ψ ⟩ {\displaystyle...9 KB (1,774 words) - 06:25, 18 February 2024
- Feynman diagram (section Path integral formulation)from Fourier transforms, this is the best standard convention for k-integrals in QFT. The lattice means that fluctuations at large k are not allowed to...93 KB (16,023 words) - 09:51, 18 August 2024
- calculate functional integrals arising in quantum field theories (QFT's). In QFT's a standard approximation strategy is to expand the functional integrals in...24 KB (3,521 words) - 06:52, 20 December 2023
- =1,q_{0}=2K+1,h^{6}/2c^{2}=\epsilon .} In studying quantum field theory (QFT), the vacuum structure of a theory may draw attention to instantons. Just...39 KB (6,383 words) - 07:54, 6 July 2024
- Hamiltonian can be sensibly formulated resides in the Feynman path integral approach to QFT. This incorporates relativistic invariance (which applies to general...27 KB (3,775 words) - 11:40, 24 July 2024
- Huygens–Fresnel principle (section Huygens' theory, Feynman's path integral and the modern photon wave function)propagation. Homogeneity of space is fundamental to quantum field theory (QFT) where the wave function of any object propagates along all available unobstructed...24 KB (3,052 words) - 06:29, 25 July 2024
- perturbative approximations to quantum field theories (QFT). When a formally divergent series in a QFT is summed using Borel summation, the associated Borel...6 KB (750 words) - 12:14, 25 July 2023
- in relativistic situations can be formulated within quantum field theory (QFT), a framework that allows the combination of quantum mechanics with special...74 KB (10,232 words) - 09:07, 10 August 2024
- the effective action are suppressed whereas in the Polchinski ERGE, the QFT is fixed once and for all but the "bare action" is varied at different energy...49 KB (6,981 words) - 14:25, 21 June 2024
- them, the first is due to Sidney Coleman, who did not publish it: A 3 + 1D QFT (quantum field theory) with a conserved 4-vector current J μ {\displaystyle...15 KB (2,566 words) - 17:42, 12 May 2024
- approach with field interpretation of ψ is the subject of QFT rather than RQM: Feynman's path integral formulation uses invariant Lagrangians rather than Hamiltonian...86 KB (10,158 words) - 03:48, 22 June 2024
- another. So what does the spacelike part of the propagator represent? In QFT the vacuum is an active participant, and particle numbers and field values...35 KB (6,207 words) - 07:25, 11 August 2024
- to the continuous spectrum of some operator, as for unbound particles in QFT, then the interpretation is more subtle. While Zee obtains the momentum space...25 KB (4,461 words) - 00:10, 27 June 2024
- He was known for his research in the mathematics of quantum field theory (QFT), especially conformal field theory. In the 1980s he collaborated with Antti...15 KB (1,391 words) - 21:30, 21 June 2023
- the configurations that must be summed to obtain a Feynman's path integral (functional integration) description of quantum gravity. It is closely related...118 KB (16,630 words) - 15:46, 6 August 2024
- e^{iS[\phi ]}} is viewed as a functional distribution (this shouldn't be taken too literally as an interpretation of QFT, unlike it's Wick rotated statistical