2.6k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Instituto Superior TécnicoPT388 papers
- Centro de Física Teórica de Partículas54 papers
- University of ViennaAT37 papers
- Centre National de la Recherche ScientifiqueFR34 papers
- University of LisbonPT34 papers
- University of MississippiUS31 papers
- Universitat de ValènciaES27 papers
- California Institute of TechnologyUS25 papers
- University of CoimbraPT19 papers
- European Organization for Nuclear ResearchCH18 papers
- Instituto de TelecomunicaçõesPT18 papers
- Instituto Politécnico de LisboaPT17 papers
70 papers · 1 filter
Gravitomagnetism and the significance of the curvature scalar invariants
L. Filipe O. Costa, Lode Wylleman, José Natário
The curvature invariants have been subject of interest due to the debate concerning the notions of intrinsic/extrinsic frame-dragging, the use of the electromagnetic analogy in suc…
Horizon thermodynamics and spacetime mappings
Valerio Faraoni, Vincenzo Vitagliano
When black holes are dynamical, event horizons are replaced by apparent and trapping horizons. Conformal and Kerr-Schild transformations are widely used in relation with dynamical…
Black holes and fundamental fields in Numerical Relativity: initial data construction and evolution of bound states
Hirotada Okawa, Helvi Witek, Vitor Cardoso
Fundamental fields are a natural outcome in cosmology and particle physics and might therefore serve as a proxy for more complex interactions. The equivalence principle implies tha…
Coalescence of binary neutron stars in a scalar-tensor theory of gravity
Masaru Shibata, Keisuke Taniguchi, Hirotada Okawa +1
We carry out numerical-relativity simulations of coalescing binary neutron stars in a scalar-tensor theory that admits spontaneous scalarization. We model neutron stars with realis…
The spherically symmetric Einstein-scalar field system with positive and vanishing cosmological constant: a comparison
João L. Costa
We review recent results concerning the spherically symmetric Einstein-scalar field system with positive cosmological constant. We do so by comparing with the classical results of…
Black holes with massive graviton hair
Richard Brito, Vitor Cardoso, Paolo Pani
No-hair theorems exclude the existence of nontrivial scalar and massive vector hair outside four-dimensional, static, asymptotically flat black-hole spacetimes. We show, by explici…
Black hole bombs and explosions: from astrophysics to particle physics
Vitor Cardoso
Black holes are the elementary particles of gravity, the final state of sufficiently massive stars and of energetic collisions. With a forty-year long history, black hole physics i…
Initial Conditions for Numerical Relativity -- Introduction to numerical methods for solving elliptic PDEs
Hirotada Okawa
Numerical relativity became a powerful tool to investigate the dynamics of binary problems with black holes or neutron stars as well as the very structure of General Relativity. Al…
Black holes with surrounding matter in scalar-tensor theories
Vitor Cardoso, Isabella P. Carucci, Paolo Pani +1
We uncover two mechanisms that can render Kerr black holes unstable in scalar-tensor gravity, both associated to the presence of matter in the vicinity of the black hole and the fa…
The role of nonmetricity in metric-affine theories of gravity
Vincenzo Vitagliano
The intriguing choice to treat alternative theories of gravity by means of the Palatini approach, namely elevating the affine connection to the role of independent variable, contai…
Scalar, Electromagnetic and Gravitational Perturbations of Kerr-Newman Black Holes in the Slow-Rotation Limit
Paolo Pani, Emanuele Berti, Leonardo Gualtieri
In Einstein-Maxwell theory, according to classic uniqueness theorems, the most general stationary black-hole solution is the axisymmetric Kerr-Newman metric, which is defined by th…
Error-analysis and comparison to analytical models of numerical waveforms produced by the NRAR Collaboration
Ian Hinder, Alessandra Buonanno, Michael Boyle +53
The Numerical-Relativity-Analytical-Relativity (NRAR) collaboration is a joint effort between members of the numerical relativity, analytical relativity and gravitational-wave data…
Astrophysical signatures of boson stars: quasinormal modes and inspiral resonances
Caio F. B. Macedo, Paolo Pani, Vitor Cardoso +1
Compact bosonic field configurations, or boson stars, are promising dark matter candidates which have been invoked as an alternative description for the supermassive compact object…
Gravity with Auxiliary Fields
Paolo Pani, Thomas P. Sotiriou, Daniele Vernieri
Modifications of General Relativity usually include extra dynamical degrees of freedom, which to date remain undetected. Here we explore the possibility of modifying Einstein's the…
Partially massless gravitons do not destroy general relativity black holes
Richard Brito, Vitor Cardoso, Paolo Pani
Recent nonlinear completions of Fierz-Pauli theory for a massive spin-2 field include nonlinear massive gravity and bimetric theories. The spectrum of black-hole solutions in these…
Gravito-Electromagnetic Perturbations of Kerr-Newman Black Holes: Stability and Isospectrality in the Slow-Rotation Limit
Paolo Pani, Emanuele Berti, Leonardo Gualtieri
The most general stationary black-hole solution of Einstein-Maxwell theory in vacuum is the Kerr-Newman metric, specified by three parameters: mass M, spin J and charge Q. Within c…
New perspectives on neutron star and black hole spectroscopy and dynamic tides
Sayan Chakrabarti, Térence Delsate, Jan Steinhoff
We elaborate on a powerful tidal interaction formalism where the multipole dynamics is kept generic and encoded in a linear response function. This response function is the gravita…
Quasinormal ringing of Kerr black holes. II. Excitation by particles falling radially with arbitrary energy
Zhongyang Zhang, Emanuele Berti, Vitor Cardoso
The analytical understanding of quasinormal mode ringing requires an accurate knowledge of the Green's function describing the response of the black hole to external perturbations.…
Matter around Kerr black holes in scalar-tensor theories: scalarization and superradiant instability
Vitor Cardoso, Isabella P. Carucci, Paolo Pani +1
In electrovacuum stationary, asymptotically flat black holes in scalar-tensor theories of gravity are described by the Kerr-Newman family of solutions, just as in general relativit…
Advanced Methods in Black-Hole Perturbation Theory
Paolo Pani
Black-hole perturbation theory is a useful tool to investigate issues in astrophysics, high-energy physics, and fundamental problems in gravity. It is often complementary to fully-…
Massive spin-2 fields on black hole spacetimes: Instability of the Schwarzschild and Kerr solutions and bounds on the graviton mass
Richard Brito, Vitor Cardoso, Paolo Pani
Massive bosonic fields of arbitrary spin are predicted by general extensions of the Standard Model. It has been recently shown that there exists a family of bimetric theories of gr…
Numerical simulations of single and binary black holes in scalar-tensor theories: circumventing the no-hair theorem
Emanuele Berti, Vitor Cardoso, Leonardo Gualtieri +2
Scalar-tensor theories are a compelling alternative to general relativity and one of the most accepted extensions of Einstein's theory. Black holes in these theories have no hair,…
Equation-of-state-independent relations in neutron stars
Andrea Maselli, Vitor Cardoso, Valeria Ferrari +2
Neutron stars are extremely relativistic objects which abound in our universe and yet are poorly understood, due to the high uncertainty on how matter behaves in the extreme condit…
Greybody factors for non-minimally coupled scalar fields in Schwarzschild-de Sitter spacetime
Luís C. B. Crispino, Atsushi Higuchi, Ednilton S. Oliveira +1
We compute the greybody factors for non-minimally coupled scalar fields in four-dimensional Schwarzschild-de Sitter spacetime. In particular, we demonstrate that the zero-angular-m…