Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- University of LisbonPT1.3k papers
- Universidade Técnica de LisboaPT388 papers
- Centre National de la Recherche ScientifiqueFR326 papers
- Instituto de Plasmas e Fusão NuclearPT209 papers
- European Organization for Nuclear ResearchCH202 papers
- Centro de Física Teórica de Partículas201 papers
- Instituto Politécnico de LisboaPT190 papers
- Instituto de TelecomunicaçõesPT175 papers
- Universitat de ValènciaES175 papers
- Institut National de Physique Nucléaire et de Physique des ParticulesFR143 papers
- Centro de Astrofísica e GravitaçãoPT133 papers
- LIP - Laboratory of Instrumentation and Experimental Particle PhysicsPT133 papers
42 papers · 2 filters
Lensing and shadow of a black hole surrounded by a heavy accretion disk
Pedro V. P. Cunha, Nelson A. Eiró, Carlos A. R. Herdeiro +1
We consider a static, axially symmetric spacetime describing the superposition of a Schwarzschild black hole (BH) with a thin and heavy accretion disk. The BH-disk configuration is…
Dynamically and thermodynamically stable black holes in Einstein-Maxwell-dilaton gravity
Dumitru Astefanesei, Jose Luis Blázquez-Salcedo, Carlos Herdeiro +2
We consider Einstein-Maxwell-dilaton gravity with the non-minimal exponential coupling between the dilaton and the Maxwell field emerging from low energy heterotic string theory. T…
Gravitomagnetism in the Lewis cylindrical metrics
L. Filipe O. Costa, José Natário, N. O. Santos
The Lewis solutions describe the exterior gravitational field produced by infinitely long rotating cylinders, and are useful models for global gravitational effects. When the metri…
Rigid elastic solids in relativity
José Natário
After briefly reviewing the theory of relativistic elasticity, we expand a general elastic Lagrangian to quadratic order and compute the main parameters for the linear elasticity o…
Environmental effects in GW physics: tidal deformability of black holes immersed in matter
Vitor Cardoso, Francisco Duque
The tidal deformability of compact objects by a companion has a detectable imprint in the gravitational waves emitted by a binary system. This effect is governed by the so-called t…
Dynamical systems methods and statefinder diagnostic of interacting vacuum energy models
Grigoris Panotopoulos, Angel Rincon, Nelson Videla +1
We study three interacting dark energy models within the framework of four-dimensional General Relativity and a spatially flat Universe. In particular, we first consider two vacuum…
Revisiting the characteristic initial value problem for the vacuum Einstein field equations
David Hilditch, Juan A. Valiente Kroon, Peng Zhao
Using the Newman-Penrose formalism we study the characteristic initial value problem in vacuum General Relativity. We work in a gauge suggested by Stewart, and following the strate…
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…
On the inexistence of self-gravitating solitons in generalised axion electrodynamics
Carlos A. R. Herdeiro, João M. S. Oliveira
Building upon the methods used recently, we establish the inexistence of self-gravitating solitonic solutions for both static and strictly stationary asymptotically flat spacetimes…
Conformally flat slices of asymptotically flat spacetimes
Miguel Duarte, David Hilditch
For mathematical convenience initial data sets in numerical relativity are often taken to be conformally flat. Employing the dual-foliation formalism, we investigate the physical c…
Cosmological attractors to general relativity and spontaneous scalarization with disformal coupling
Hector O. Silva, Masato Minamitsuji
The canonical scalar-tensor theory model which exhibits spontaneous scalarization in the strong-gravity regime of neutron stars has long been known to predict a cosmological evolut…
EHT constraint on the ultralight scalar hair of the M87 supermassive black hole
Pedro V. P. Cunha, Carlos A. R. Herdeiro, Eugen Radu
Hypothetical ultralight bosonic fields will spontaneously form macroscopic bosonic halos around Kerr black holes, via superradiance, transferring part of the mass and angular momen…
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…
Boundedness of massless scalar waves on Kerr interior backgrounds
Anne T. Franzen
We consider solutions of the massless scalar wave equation , without symmetry, on fixed subextremal Kerr backgrounds . It follows from previous analyses…
Test fields cannot destroy extremal de Sitter black holes
Jose Natario, Rodrigo Vicente
We determine the timelike Killing vector field that gives the correct definition of energy for test fields propagating in a Kerr-Newman-de Sitter spacetime, and use this result to…
Superradiant instability of charged scalar fields in higher-dimensional Reissner-Nordström-de Sitter black holes
Kyriakos Destounis
Black holes possess trapping regions which lead to intriguing dynamical effects. By properly scattering test fields off a black hole, one can extract energy from it, leading to the…
Generalized Galileon Scenario Inspires Chaotic Inflation
Matías López, Jorge Maggiolo, Nelson Videla +2
We study chaotic inflation with a Galileon-like self interaction , where . General conditions required for successful inflation are deduced and d…
Moving black holes: energy extraction, absorption cross-section and the ring of fire
Vitor Cardoso, Rodrigo Vicente
We consider the interaction between a plane wave and a (counter-moving) black hole. We show that energy is transferred from the black hole to the wave, giving rise to a negative ab…
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…
Spontaneous scalarization of charged black holes in the Scalar-Vector-Tensor theory
Taishi Ikeda, Tomohiro Nakamura, Masato Minamitsuji
We present spontaneous scalarization of charged black holes (BHs) which is induced by the coupling of the scalar field to the electromagnetic field strength and the double-dual Rie…
Cosmological phase space of generalized hybrid metric-Palatini theories of gravity
João L. Rosa, Sante Carloni, José P. S. Lemos
Using a dynamical system approach we study the cosmological phase space of the generalized hybrid metric-Palatini gravity theory, characterized by the function $f\left(R,\mathcal R…
Model comparison from LIGO-Virgo data on GW170817's binary components and consequences for the merger remnant
The LIGO Scientific Collaboration, the Virgo Collaboration, B. P. Abbott +1191
GW170817 is the very first observation of gravitational waves originating from the coalescence of two compact objects in the mass range of neutron stars, accompanied by electromagn…
Charged black holes with axionic-type couplings: classes of solutions and dynamical scalarisation
Pedro G. S. Fernandes, Carlos A. R. Herdeiro, Alexandre M. Pombo +2
We consider an augmented Einstein-Maxwell-scalar model including an axionic-type coupling between the scalar and electromagnetic field. We study dyonic black hole solutions in this…
Non-linear dynamics of spinning bosonic stars: formation and stability
N. Sanchis-Gual, F. Di Giovanni, M. Zilhão +4
We perform numerical evolutions of the fully non-linear Einstein-(complex, massive)Klein-Gordon and Einstein-(complex)Proca systems, to assess the formation and stability of spinni…