69 citations · 486 across the 26 of their papers we have counts for
5 papers · 1 filter
Causal Structure and Birefringence in Nonlinear Electrodynamics
C. A. M. de Melo, L. G. Medeiros, P. J. Pompeia
We investigate the causal structure of general nonlinear electrodynamics and determine which Lagrangians generate an effective metric conformal to Minkowski. We also proof that the…
Hamilton-Jacobi Approach for First Order Actions and Theories with Higher Derivatives
M. C. Bertin, B. M. Pimentel, P. J. Pompeia
In this work we analyze systems described by Lagrangians with higher order derivatives in the context of the Hamilton-Jacobi formalism for first order actions. Two different approa…
First Order Actions: a New View
M. C. Bertin, B. M. Pimentel, P. J. Pompeia
We analyse systems described by first order actions using the Hamilton-Jacobi (HJ) formalism for singular systems. In this study we verify that generalized brackets appear in a nat…
Schwinger's Principle and Gauge Fixing in the Free Electromagnetic Field
C. A. M. de Melo, B. M. Pimentel, P. J. Pompeia
A manifestly covariant treatment of the free quantum eletromagnetic field, in a linear covariant gauge, is implemented employing the Schwinger's Variational Principle and the B-fie…
Second Order Gauge Theory
R. R. Cuzinatto, C. A. M. de Melo, P. J. Pompeia
A gauge theory of second order in the derivatives of the auxiliary field is constructed following Utiyama's program. A novel field strength arises besides the on…