Results 111 to 120 of about 86,518 (263)

Integral representation of the scalar propagators on the de Sitter expanding universe

European Physical Journal C: Particles and Fields, 2019
A new type of integral representation is proposed for the propagators of the massive Klein–Gordon field minimally coupled to gravity of the de Sitter expanding universe.
Ion I. Cotăescu, Ion Cotăescu
doaj   +1 more source

Numerical Feynman integrals with physically inspired interpolation: Faster convergence and significant reduction of computational cost

AIP Advances, 2012
One of the most successful methods for calculating reduced density operator dynamics in open quantum systems, that can give numerically exact results, uses Feynman integrals. However, when simulating the dynamics for a given amount of time, the number of
Nikesh S. Dattani
doaj   +1 more source

Notes on the Feynman integral. I [PDF]

, 1981
Gerald W. Johnson, David Skoug
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Feynman path integrals on compact Lie groups with bi-invariant Riemannian metrics [PDF]

, 2023
Nicolò Drago, Sonia Mazzucchi, Valter Moretti   +2 more
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Renormalization and running in the 2D CP (1) model

Journal of High Energy Physics
We calculate the scattering amplitude in the two dimensional CP (1) model in a regularization scheme independent way. When using cutoff regularization, a new Feynman rule from the path integral measure is required if one is to preserve the symmetry.
Diego Buccio, John F. Donoghue, Gabriel Menezes, Roberto Percacci   +3 more
doaj   +1 more source

Asymptotic Estimates of Feynman Integrals [PDF]

Journal of Mathematical Physics, 1968
In this paper, we consider the problem of determining logarithmic, as well as polynomial, asymptotic estimates for certain convergent integrals containing parameters. We state and prove an asymptotic theorem which gives the logarithmic asymptotic behavior of a convergent integral where any subset of the parameters becomes large while the remaining ...
openaire   +1 more source

Generalized Hypergeometric Functions and the Evaluation of Scalar\n One-loop Integrals in Feynman Diagrams [PDF]

, 1998
Luis G. Cabral–Rosetti, Miguel-Angel Sanchis-Lozano   +1 more
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Feynman Integrals, Toric Geometry and Mirror Symmetry [PDF]

, 2019
Pierre Vanhove
openalex   +1 more source

On approximations of Feynman path integrals [PDF]

, 2022
Tapani Hyttinen
openalex   +1 more source

Anti-de Sitter, plane waves and quantum field theory

Physics Letters B
We present a new plane-wave expansion of the Wightman functions of anti de Sitter scalar fields and showcase its conceptual and technical importance in AdS quantum field theory.
Ugo Moschella
doaj   +1 more source