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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)...

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 ,...

field theory (QFT) is a theoretical framework that combines classical field theory, special relativity, and quantum mechanics.: xi  QFT is used in particle...

"physical" asymptotic states when performing QFT calculations. Crucially, this symmetry of the path integral is preserved in loop order, and thus prevents...

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...

polynomially bounded functional F {\displaystyle F} over the field configurations, then, for any state vector (which is a solution of the QFT), | ψ ⟩ {\displaystyle...

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...

calculate functional integrals arising in quantum field theories (QFT's). In QFT's a standard approximation strategy is to expand the functional integrals in...

=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...

Hamiltonian can be sensibly formulated resides in the Feynman path integral approach to QFT. This incorporates relativistic invariance (which applies to general...

propagation. Homogeneity of space is fundamental to quantum field theory (QFT) where the wave function of any object propagates along all available unobstructed...

perturbative approximations to quantum field theories (QFT). When a formally divergent series in a QFT is summed using Borel summation, the associated Borel...

in relativistic situations can be formulated within quantum field theory (QFT), a framework that allows the combination of quantum mechanics with special...

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...

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...

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...

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...

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...

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...

the configurations that must be summed to obtain a Feynman's path integral (functional integration) description of quantum gravity. It is closely related...