55 citations · 301 across the 35 of their papers we have counts for
35 papers
Noncommutative fields in curved space
J. Barcelos-Neto
We consider a noncommutative theory developed in a curved background. We show that the Moyal product has to be conveniently modified and, consequently, some of its old properties a…
Time-dependent cosmological constant in the Jackiw-Teitelboim cosmology
M. Alves, J. Barcelos-Neto, M. Novello +1
We study the obtainment of a time-dependent cosmological constant at D=2 in a model based on the Jackiw-Teitelboim cosmology. We show that the cosmological term goes to zero asympt…
Statistical transmutation of quantum bosonic strings coupled to general four-dimensional Chern-Simons theory
J. Barcelos-Neto, E. C. Marino
A bosonic string coupled to the generalized Chern-Simons theory in 3+1D acquires a magnetic field along itself, when it is closed, and a topological charge at its extremity, when i…
A model for time-dependent cosmological constant and its consistency with the present Friedmann universe
M. Novello, J. Barcelos-Neto, J. M. Salim
We use a model where the cosmological term can be related to the chiral gauge anomaly of a possible quantum scenario of the initial evolution of the universe. We show that this ter…
Compactification of gauge theories and the gauge invariance of massive modes
R. Amorim, J. Barcelos-Neto
We study the gauge invariance of the massive modes in the compactification of gauge theories from D=5 to D=4. We deal with Abelian gauge theories of rank one and two, and with non-…
Remarks on the canonical quantization of noncommutative theories
R. Amorim, J. Barcelos-Neto
Free noncommutative fields constitute a natural and interesting example of constrained theories with higher derivatives. The quantization methods involving constraints in the highe…