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
75 papers · 2 filters
The Weak Null Condition in Free-evolution Schemes for Numerical Relativity: Dual Foliation GHG with Constraint Damping
Edgar Gasperin, David Hilditch
All strategies for the treatment of future null-infinity in numerical relativity involve some form of regularization of the field equations. In a recent proposal that relies on the…
Scalarized black holes in the presence of the coupling to Gauss-Bonnet gravity
Masato Minamitsuji, Taishi Ikeda
In this paper, we study static and spherically symmetric black hole (BH) solutions in the scalar-tensor theories with the coupling of the scalar field to the Gauss-Bonnet (GB) term…
Hyperbolicity of Divergence Cleaning and Vector Potential Formulations of GRMHD
David Hilditch, Andreas Schoepe
We examine hyperbolicity of general relativistic magnetohydrodynamics with divergence cleaning, a flux-balance law form of the model not covered by our earlier analysis. The calcul…
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…
Gravitating solitons and black holes with synchronised hair in the four dimensional O(3) sigma-model
C. Herdeiro, I. Perapechka, E. Radu +1
We consider the non-linear sigma-model, composed of three real scalar fields with a standard kinetic term and with a symmetry breaking potential in four spacetime d…
Magnetized accretion disks around Kerr black holes with scalar hair - I. Constant angular momentum disks
Sergio Gimeno-Soler, José A. Font, Carlos Herdeiro +1
Testing the true nature of black holes - the no-hair hypothesis - will become increasingly more precise in the next few years as new observational data is collected in both the gra…
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…
Greybody factors and quasinormal modes for a nonminimally coupled scalar field in a cloud of strings in (2+1)-dimensional background
Ángel Rincón, Grigoris Panotopoulos
We study the propagation of a probe massless nonminimally coupled scalar field in a fixed gravitational background of a cloud of strings in (2+1) dimensions. We obtain exact analyt…
Elastic shocks in relativistic rigid rods and balls
João L. Costa, José Natário
We study the free boundary problem for the "hard phase" material introduced by Christodoulou, both for rods in (1+1)-dimensional Minkowski spacetime and for spherically symmetric b…
Charged Fermions and Strong Cosmic Censorship
Kyriakos Destounis
It was recently shown that the Strong Cosmic Censorship conjecture might be violated for near-extremally-charged black holes in de Sitter space. Here, we extend our study to charge…
Anisotropic stars as ultracompact objects in General Relativity
Guilherme Raposo, Paolo Pani, Miguel Bezares +2
Anisotropic stresses are ubiquitous in nature, but their modeling in General Relativity is poorly understood and frame dependent. We introduce the first study on the dynamical prop…
Particle creation in gravitational collapse to a horizonless compact object
Tomohiro Harada, Vitor Cardoso, Daiki Miyata
Black holes (BHs) play a central role in physics. However, gathering observational evidence for their existence is a notoriously difficult task. Current strategies to quantify the…
Electromagnetic emission from axionic clouds and the quenching of superradiant instabilities
Taishi Ikeda, Richard Brito, Vitor Cardoso
The nature of dark matter is one of the longest-standing puzzles in science. Axions or axion-like particles are a key possibility, and arise in mechanisms to solve the strong CP pr…
Axionic instabilities and new black hole solutions
Mateja Boskovic, Richard Brito, Vitor Cardoso +2
The coupling between scalar and vector fields has a long and interesting history. Axions are one key possibility to solve the strong CP problem and axion-like particles could be on…
From micro to macro and back: probing near-horizon quantum structures with gravitational waves
Andrea Maselli, Paolo Pani, Vitor Cardoso +3
Supermassive binaries detectable by the future space gravitational-wave interferometer LISA might allow to distinguish black holes from ultracompact horizonless objects, even when…
Gravitational Collapse of a Massless Scalar Field in a Periodic Box
Chul-Moon Yoo, Taishi Ikeda, Hirotada Okawa
Gravitational collapse of a massless scalar field with the periodic boundary condition in a cubic box is reported. This system can be regarded as a lattice universe model. We const…
The scalarised Schwarzschild-NUT spacetime
Yves Brihaye, Carlos Herdeiro, Eugen Radu
It has recently been suggested that vacuum black holes of General Relativity (GR) can become spontaneously scalarised when appropriate non-minimal couplings to curvature invariants…
Minimal Geometric Deformation in a cloud of strings
Grigoris Panotopoulos, Ángel Rincón
We find new exact analytical solutions in three-dimensional gravity applying the Minimal Geometric Deformation approach in a cloud of strings.
Classical and quantum aspects of electric-magnetic duality rotations in curved spacetimes
Ivan Agullo, Adrian del Rio, Jose Navarro-Salas
It is well known that the source-free Maxwell equations are invariant under electric-magnetic duality rotations, F --> F cos θ + *F sin θ. These transformations are indeed a symmet…
Stealth Schwarzschild solution in shift symmetry breaking theories
Masato Minamitsuji, Hayato Motohashi
We find stealth Schwarzschild solutions with a nontrivial profile of the scalar field regular on the horizon in the Einstein gravity coupled to the scalar field with the k-essence…
Synchronized stationary clouds in a static fluid
Carolina L. Benone, Luís C. B. Crispino, Carlos A. R. Herdeiro +1
The existence of stationary bound states for the hydrodynamic velocity field between two concentric cylinders is established. We argue that rotational motion, together with a trapp…
Strong cosmic censorship: The nonlinear story
Raimon Luna, Miguel Zilhão, Vitor Cardoso +2
A satisfactory formulation of the laws of physics entails that the future evolution of a physical system should be determined from appropriate initial conditions. The existence of…
Baryogenesis via leptogenesis in multi-field inflation
Grigoris Panotopoulos, Nelson Videla
In multi-field reheating after modular -inflation we investigate the conditions under which baryogenesis via non-thermal leptogenesis can be successfully realized. We introduce…
Scattering of scalar, electromagnetic and gravitational waves from binary systems
Lorenzo Annulli, Laura Bernard, Diego Blas +1
The direct detection of gravitational waves crowns decades of efforts in the modelling of sources and of increasing detectors' sensitivity. With future third-generation Earth-based…