306 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Universidade do PortoPT174 papers
- University of CoimbraPT98 papers
- University of MinhoPT81 papers
- University of LisbonPT24 papers
- Centre National de la Recherche ScientifiqueFR22 papers
- Instituto Superior TécnicoPT22 papers
- UCLouvainBE13 papers
- Universidade Federal da BahiaBR13 papers
- Centro de Análise Matemática Geometria e Sistemas DinâmicosPT10 papers
- Pontifícia Universidade Católica do Rio de JaneiroBR10 papers
- Universidad de La LagunaES9 papers
- Universidade Federal do Rio de JaneiroBR9 papers
31 papers · 1 filter
A convenient gauge for virial identities in axial symmetry
Joao M. S. Oliveira, Alexandre M. Pombo
Virial identities are a useful mathematical tool in General Relativity. Not only have they been used as a numerical accuracy tool, but they have also played a significant role in e…
Deconstructing scaling virial identities in General Relativity: spherical symmetry and beyond
Carlos A. R. Herdeiro, João M. S. Oliveira, Alexandre M. Pombo +1
Derrick-type virial identities, obtained via dilatation (scaling) arguments, have a variety of applications in field theories. We deconstruct such virial identities in relativistic…
Primordial magnetic fields in theories of gravity with non-minimal coupling between curvature and matter
Orfeu Bertolami, Maria Margarida Lima, Filipe C. Mena
The existence of magnetic fields in the universe is unmistakable. They are observed at all scales from stars to galaxy clusters. However, the origin of these fields remains enigmat…
Quasinormal modes and stability of boosted Reissner-Nordström AdS black holes
Rodrigo D. B. Fontana, Filipe C. Mena
We investigate the numerical stability of accelerated AdS black holes against linear scalar perturbations. In particular, we study the evolution of a probe non-minimally coupled sc…
Higher dimensional black hole scalarization
Dumitru Astefanesei, Carlos Herdeiro, João Oliveira +1
In the simplest scalar-tensor theories, wherein the scalar field is non-minimally coupled to the Ricci scalar, spontaneous scalarization of electrovacuum black holes (BHs) does not…
Stability of the Cauchy horizon in accelerating black-hole spacetimes
Kyriakos Destounis, Rodrigo D. B. Fontana, Filipe C. Mena
The extendibility of spacetime and the existence of weak solutions to the Einstein field equations beyond Cauchy horizons, is a crucial ingredient to examine the limits of General…
Global dynamics of Yang-Mills field and perfect-fluid Robertson-Walker cosmologies
Artur Alho, Vitor Bessa, Filipe C. Mena
We apply a new global dynamical systems formulation to flat Robertson-Walker cosmologies with a massless and massive Yang-Mills field and a perfect-fluid with linear equation of st…
Singularity theorems and the inclusion of torsion in affine theories of gravity
Paulo Luz, Filipe C. Mena
We extend the scope of the Raychaudhuri-Komar singularity theorem of General Relativity to affine theories of gravity with and without torsion. We first generalize the existing foc…
Strong Cosmic Censorship in Horndeski Theory
Kyriakos Destounis, Rodrigo D. B. Fontana, Filipe C. Mena +1
The strong cosmic censorship hypothesis has recently regained a lot of attention in charged and rotating black holes immersed in de Sitter space. Although the picture seems to be c…
Static compact objects in Einstein-Cartan theory
Paulo Luz, Sante Carloni
We generalize the Tolman-Oppenheimer-Volkoff equations for space-times endowed with a Weyssenhoff like torsion field in the Einstein-Cartan theory. The new set of structure equatio…
Influence of intrinsic spin in the formation of singularities for inhomogeneous effective dust space-times
Paulo Luz, Filipe C. Mena, Amir Hadi Ziaie
The evolution of inhomogeneous space-times composed of uncharged fermions is studied for Szekeres metrics which have no Killing vectors, in general. Using the Einstein-Cartan theor…
Gravitational radiation and the evolution of gravitational collapse in cylindrical symmetry
Alfonso García-Parrado, Filipe C. Mena
Using the Sparling form and a geometric construction adapted to spacetimes with a 2-dimensional isometry group, we analyse a quasi-local measure of gravitational energy. We then st…
Conformal geodesics in spherically symmetric vacuum spacetimes with Cosmological constant
Alfonso García-Parrado Gómez-Lobo, Edgar Gasperin, Juan A. Valiente Kroon
An analysis of conformal geodesics in the Schwarzschild-de Sitter and Schwarzschild-anti de Sitter families of spacetimes is given. For both families of spacetimes we show that ini…
New conserved currents for vacuum space-times in dimension four with a Killing vector
Alfonso García-Parrado Gómez-Lobo
A new family of conserved currents for vacuum space-times with a Killing vector is presented. The currents are constructed from the superenergy tensor of the Mars-Simon tensor and…
Relative information entropy in cosmology: The problem of information entanglement
Viktor G. Czinner, Filipe C. Mena
The necessary information to distinguish a local inhomogeneous mass density field from its spatial average on a compact domain of the universe can be measured by relative informati…
Vacuum type D initial data
Alfonso García-Parrado Gómez-Lobo
A vacuum type D initial data set is a vacuum initial data set of the Einstein field equations whose data development contains a region where the space-time is of Petrov type D. In…
Rényi entropy and the thermodynamic stability of black holes
Viktor G. Czinner, Hideo Iguchi
Thermodynamic stability of black holes, described by the Rényi formula as equilibrium compatible entropy function, is investigated. It is shown that within this approach, asymptoti…
A local non-negative initial data scalar characterisation of the Kerr solution
Alfonso García-Parrado Gómez-Lobo
For any vacuum initial data set, we define a local, non-negative scalar quantity which vanishes at every point of the data hypersurface if and only if the data are {\em Kerr initia…
Thick Dirac-Nambu-Goto branes on black hole backgrounds
Viktor G. Czinner
Thickness corrections to static, axisymmetric Dirac-Nambu-Goto branes embedded into spherically symmetric black hole spacetimes with arbitrary number of dimensions are studied. Fir…
Axisymmetric Dirac-Nambu-Goto branes on Myers-Perry black hole backgrounds
Viktor G. Czinner
Stationary, D-dimensional test branes, interacting with N-dimensional Myers-Perry bulk black holes, are investigated in arbitrary brane and bulk dimensions. The branes are asymptot…
Covariant and gauge-invariant linear scalar perturbations in multiple scalar field cosmologies
Artur Alho, Filipe C. Mena
We derive a set of equations monitoring the evolution of covariant and gauge-invariant linear scalar perturbations of Friedman-Lemaître-Robertson-Walker models with multiple intera…
A q-parameter bound for particle spectra based on black hole thermodynamics with Rényi-entropy
Tamás S. Biró, Viktor G. Czinner
By regarding the Hawking-Bekenstein entropy of Schwarzschild black hole horizons as a non-extensive Tsallis entropy, its formal logarithm, the Rényi entropy, is considered. The res…
On the conservation of Superenergy and its applications
Alfonso García-Parrado Gómez-Lobo
In this work we present a geometric identity involving the Bel-Robinson tensor which is formally similar to the Sparling identity (which involves the Einstein tensor through the Ei…
Review on exact and perturbative deformations of the Einstein-Straus model: uniqueness and rigidity results
Marc Mars, Filipe C. Mena, Raül Vera
The Einstein-Straus model consists of a Schwarzschild spherical vacuole in a Friedman-Lema\^ıtre-Robertson-Walker (FLRW) dust spacetime (with or without Λ). It constitutes the most…