207 citations · 1.3k across the 53 of their papers we have counts for
5 papers · 1 filter
Non-linear electrodynamics and the acceleration of the universe
M. Novello, S. E. Perez Bergliaffa, J. Salim
It is shown that the addition of a non-linear term to the Lagrangian of the electromagnetic field yields a fluid with an asymptotically super-negative equation of state, causing an…
Reply to "Acausality of Massive Charged Spin 2 Fields"
M. Novello, S. E. Perez Bergliaffa, R. P. Neves
We show that, contrary to the claim in hep-th/0304050, the propagation of a spin-2 field in an electromagnetic background is {\em causal}.
Effective Geometry
M. Novello, S. E. Perez Bergliaffa
We introduce the concept of effective geometry by studying several systems in which it arises naturally. As an example of the power and conciseness of the method, it is shown that…
Propagation of perturbations in non-linear spin-2 theories
Santiago E. Perez Bergliaffa
In this communication I analyze the problem of complete exceptionality of wave propagation in a class of spin 2 field theories. I show that, under the imposition of the good weak-f…
Causality and charged spin-2 fields in an electromagnetic background
M. Novello, S. E. Perez Bergliaffa, R. P. Neves
We show that, contrary to common belief, the propagation of a spin-2 field in an electromagnetic background is {\em causal}. The proof will be given in the Fierz formalism which, a…