6 papers
A Lagrangian formulation for Rastall gravity and a covariant formulation for unimodular gravity
Juilson A. P. Paiva, Julio C. Fabris, Vilson T. Zanchin
We propose a Lagrangian formulation for a non-conservative gravity model in which the divergence of the energy-momentum tensor in curved spacetime does not vanish. This is accompli…
Transport coefficients and quasinormal modes in Einstein-dilaton holographic QCD
Nairy A. Villarreal, Luis A. H. Mamani, Alfonso Ballon-Bayona +2
In this paper, we investigate the transport coefficients of a strongly coupled plasma in the context of holographic QCD models based on Einstein-dilaton gravity that are compatible…
Kerr-Newman outside a rotating de Sitter-type core: A rotating version of the Lemos-Zanchin electrically charged solution
Marcos L. W. Basso, Vilson T. Zanchin
A rotating version of the solution of the Einstein-Maxwell system of equations modeling static electrically charged regular black holes by Lemos and Zanchin [Phys. Rev. D 83, 12400…
Regular Kerr black holes: Junction conditions and the matter content across the ring
Marcos L. W. Basso, Vilson T. Zanchin
Regular rotating black holes are usually described by a metric of the Kerr-Schild form with a particular mass function that is chosen to avoid the ring singularity of the Kerr metr…
Comment on "Apparent horizons of the Thakurta spacetime and the description of cosmological black holes"
Alan Maciel, Vilson T. Zanchin
The findings discussed in "Apparent Horizons of the Thakurta Spacetime and the Description of Cosmological Black Holes" deviate from prior research, particularly our study in Phys.…
Compact regular objects from an electrified Tolman-like density: A new interior region for the Kerr-Newman spacetime
Marcos L. W. Basso, Vilson T. Zanchin
Charged static and rotating objects as solutions of the Einstein-Maxwell field equations are obtained and studied in the present work. The full spacetime geometry is obtained by ma…