175 citations · 894 across the 25 of their papers we have counts for
25 papers
Coupled by Design: Computing Kerr-Newman Quasinormal Modes with a Hybrid SpectralPINN Solver
Alexandre M. Pombo
We extend our \texttt{SpectralPINN} solver to the computation of Kerr-Newman quasinormal modes by applying it to solve the system of two coupled master PDEs -- advancing from the s…
Teukolsky by Design: A Hybrid Spectral-PINN solver for Kerr Quasinormal Modes
Alexandre M. Pombo, Lorenzo Pizzuti
We introduce SpectralPINN, a hybrid pseudo-spectral/physics-informed neural network (PINN) solver for Kerr quasinormal modes that targets the Teukolsky equation in both the separat…
-balls, neural networks and galaxy rotation curves
Alexandre M. Pombo, Lorenzo Pizzuti, Alessandra di Giacomo
Can a dynamically robust (\textit{aka} stable) -ball reproduce the rotation curve of a disk galaxy? In an astrophysical environment, -balls are non-topological solitons that…
CLASH-VLT: Constraining deviation from GR with the mass profiles of nine massive galaxy clusters
L. Pizzuti, A. Biviano, K. Umetsu +5
We investigate the anisotropic stress parameter, , defined as the ratio of the gravitational potentials in the linearly perturbed Friedmann-Lemaître Robertson-Walker metric,…
Black holes and solitonic objects with bosonic fields
Alexandre M. Pombo
Black holes (BH) are among the most unusual and exciting physical objects. Besides being simultaneously Relativistic and quantum mechanical objects, which allows the discovery and/…
The shape of the Chameleon fifth-force on the mass components of galaxy clusters
Lorenzo Pizzuti, Valentina Amatori, Alexandre M. Pombo +1
In the context of Chameleon gravity, we present a semi-analytical solution of the chameleon field profile in accurately modelled galaxy cluster's mass components, namely: the stell…
Mass Modeling and Kinematics of Galaxy Clusters in Modified Gravity
Lorenzo Pizzuti, Yacer Boumechta, Sandeep Haridasu +6
The chameleon screening mechanism has been constrained many a time using dynamic and kinematic galaxy cluster observables. Current constraints are, however, insensitive to differen…
Virial identities across the spacetime
Alexandre M. Pombo, Lorenzo Pizzuti
Virial-like identities obtained through Derrick's scaling argument are powerful, multi-purpose tools to study general relativistic models. Applications comprise establishing no-go/…
Mixed scalarization of charged black holes: from spontaneous to non-linear scalarization
Zakaria Belkhadria, Alexandre M. Pombo
Scalarized black holes (BH) have been shown to form dynamically in extended-scalar-tensor theories, either through spontaneous scalarization -- when the BH is unstable against line…
The spooky ghost of vectorization
Lorenzo Pizzuti, Alexandre M. Pombo
An interesting mechanism for the formation of hairy black holes occurs when a vector field, non-minimally coupled to a source term, grows from a perturbation of the vacuum black ho…
Effects of mass and self-interaction on nonlinear scalarization of scalar-Gauss-Bonnet black holes
Alexandre M. Pombo, Daniela D. Doneva
It was recently found that in certain flavours of scalar-Gauss-Bonnet gravity linearly stable bald black holes can co-exist with stable scalarized solutions. The transition between…
Scalaroca stars: coupled scalar-Proca solitons
Alexandre M. Pombo, João M. S. Oliveira, Nuno M. Santos
We construct and explore the physical properties of \textit{scalaroca stars}: spherically symmetric solitonic solutions made of a complex scalar field and a complex Proca field…
A Sun-like star orbiting a boson star
Alexandre M. Pombo, Ippocratis D. Saltas
The high-precision astrometric mission GAIA recently reported the remarkable discovery of a Sun-like star closely orbiting a dark object, with a semi-major axis and period of $1.4\…
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…
Aspects of Gauss-Bonnet scalarisation of charged black holes
Carlos A. R. Herdeiro, Alexandre M. Pombo, Eugen Radu
The general relativity vacuum black holes (BHs) can be scalarised in models where a scalar field non-minimally couples to the Gauss-Bonnet (GB) invariant. Such GB scalarisation com…
Virial identities in relativistic gravity: 1D effective actions and the role of boundary terms
Carlos A. R. Herdeiro, João M. S. Oliveira, Alexandre M. Pombo +1
Virial (aka scaling) identities are integral identities that are useful for a variety of purposes in non-linear field theories, including establishing no-go theorems for solitonic…
The imitation game: Proca stars that can mimic the Schwarzschild shadow
Carlos A. R. Herdeiro, Alexandre M. Pombo, Eugen Radu +2
Can a dynamically robust bosonic star (BS) produce an (effective) shadow that mimics that of a black hole (BH)? The BH shadow is linked to the existence of light rings (LRs). For f…
Spontaneous vectorization of electrically charged black holes
João M. S. Oliveira, Alexandre M. Pombo
In this work, we generalise the spontaneous scalarization phenomena in Einstein-Maxwell-Scalar models to a higher spin field. The result is an Einstein-Maxwell-Vector model wherein…
Quasinormal modes of hot, cold and bald Einstein-Maxwell-scalar black holes
Jose Luis Blázquez-Salcedo, Carlos A. R. Herdeiro, Sarah Kahlen +3
Einstein-Maxwell-scalar models allow for different classes of black hole solutions, depending on the non-minimal coupling function employed, between the scalar field and the…
Einstein-Maxwell-scalar black holes: the hot, the cold and the bald
Jose Luis Blázquez-Salcedo, Carlos A. R. Herdeiro, Jutta Kunz +2
The phenomenon of spontaneous scalarisation of charged black holes (BHs) has recently motivated studies of various Einstein-Maxwell-scalar models. Within these models, different cl…
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…
Einstein-Maxwell-scalar black holes: classes of solutions, dyons and extremality
D. Astefanesei, C. Herdeiro, A. Pombo +1
Spherical black hole (BH) solutions in Einstein-Maxwell-scalar (EMS) models wherein the scalar field is non-minimally coupled to the Maxwell invariant by some coupling function are…
Spontaneous scalarisation of charged black holes: coupling dependence and dynamical features
Pedro G. S. Fernandes, Carlos A. R. Herdeiro, Alexandre M. Pombo +2
Spontaneous scalarisation of electrically charged, asymptotically flat Reissner-Nordström black holes (BHs) has been recently demonstrated to occur in Einstein-Maxwell-Scalar (EMS)…