25 citations · 34 across the 4 of their papers we have counts for
14 papers
Form factors and non-local Multiplicative Anomaly for fermions with background torsion
Guilherme de Berredo-Peixoto, Alan E. Maicá
We analyse the Multiplicative Anomaly (MA) in the case of quantized massive fermions coupled to a background torsion. The one-loop Effective Action (EA) can be expressed in terms o…
Trajectories in a space with a spherically symmetric dislocation
Alcides F. Andrade, Guilherme de Berredo-Peixoto
We consider a new type of defect in the scope of linear elasticity theory, using geometrical methods. This defect is produced by a spherically symmetric dislocation, or ball disloc…
Universality and ambiguity in fermionic effective actions
Guilherme de Berredo-Peixoto, Dante D. Pereira, Ilya L. Shapiro
We discuss an ambiguity in the one-loop effective action of massive fields which takes place in massive fermionic theories. The universality of logarithmic UV divergences in differ…
Dirac fields, torsion and Barbero-Immirzi parameter in Cosmology
G. de Berredo-Peixoto, L. Freidel, I. L. Shapiro +1
We consider cosmological solution for Einstein gravity with massive fermions with a four-fermion coupling, which emerges from the Holst action and is related to the Barbero-Immirzi…
On the 1-loop calculations of softly broken fermion-torsion theory in curved space using the Stuckelberg procedure
G. de Berredo-Peixoto
The soft breaking of gauge or other symmetries is the typical Quantum Field Theory phenomenon. In many cases one can apply the Stuckelberg procedure, which means introducing some a…
One-loop corrections to the photon propagator in the curved-space QED
Bruno Gonçalves, Guilherme de Berredo-Peixoto, Ilya L. Shapiro
We calculate and discuss the one-loop corrections to the photon sector of QED interacting to a background gravitational field. At high energies the fermion field can be taken as ma…