68 citations · 535 across the 36 of their papers we have counts for
8 papers · 1 filter
Wavepackets on de Sitter spacetime
João C. A. Barata, Marcos Brum
We construct wavepackets on de Sitter spacetime, with masses consistently defined from the eigenvalues of an irreducible representation of a Casimir element in the universal envelo…
Interacting Quantum Fields on de Sitter Space
João C. A. Barata, Christian D. Jäkel, Jens Mund
In 1975 Figari, Høegh-Krohn and Nappi constructed the P(phi)_2 model on the de Sitter space. Here we complement their work with new results, as well as by connecting this model to…
The Model on the de Sitter Space
João C. A. Barata, Christian D. Jäkel, Jens Mund
In 1975 by Figari, Høegh-Krohn and Nappi constructed the model on the two-dimensional de Sitter space. Here we complement their work with a number of new result…
Octonionic formulation of the fully symmetric Maxwell's equations in 3+1 dimensions
K. Pushpa, J. C. A. Barata
Using octonions, more specifically, using a 4 x 4 matrix representation of octonions obtained with the help of algebraic properties of quaternions, we obtain the fully symmetric Ma…
The Coulomb phase shift revisited
J. C. A. Barata, L. F. Canto, M. S. Hussein
We investigate the Coulomb phase shift, and derive and analyze new and more precise analytical formulae. We consider next to leading order terms to the Stirling approximation, and…
Stability for quasi-periodically perturbed Hill's equations
Guido Gentile, Daniel A. Cortez, Joao C. A. Barata
We consider a perturbed Hill's equation of the form , where is real analytic and periodic, is real analytic and quasi-periodic…