142 citations · 1.6k across the 120 of their papers we have counts for
4 papers · 1 filter
Noncommutative cosmological models coupled to a perfect fluid and a cosmological constant
E. M. C. Abreu, M. V. Marcial, A. C. R. Mendes +2
In this work we carry out a noncommutative analysis of several Friedmann-Robert-Walker models, coupled to different types of perfect fluids and in the presence of a cosmological co…
Causality in noncommutative spacetime
Everton M. C. Abreu, Mario J. Neves
In this paper we investigated the causality problem present in the recent work about the Doplicher-Fredenhagen-Roberts-Amorim (DFRA) noncommutative framework which analyzed the com…
Lagrangian formulation for noncommutative nonlinear systems
E. M. C. Abreu, J. Ananias Neto, A. C. R. Mendes +3
In this work we use the well known formalism developed by Faddeev and Jackiw to introduce noncommutativity within two nonlinear systems, the SU(2) Skyrme and O(3) nonlinear sigma m…
Fractional Dirac Bracket and Quantization for Constrained Systems
Everton M. C. Abreu, Cresus F. L. Godinho
So far, it is not well known how to deal with dissipative systems. There are many paths of investigation in the literature and none of them present a systematic and general procedu…