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
31 papers · 2 filters
Black holes and quasiblack holes: Some history and remarks
José P. S. Lemos
A brief reference to the two Schwarzschild solutions and what Petrov had to say about them is given. Comments on how the Schwarzschild vacuum solution describes a black hole are al…
The holographic induced gravity model with a Ricci dark energy: smoothing the little rip and big rip through Gauss-Bonnet effects?
Moulay-Hicham Belkacemi, Mariam Bouhmadi-Lopez, Ahmed Errahmani +1
We present an holographic brane-world model of the Dvali-Gabadadze-Porrati (DGP) scenario with and without a Gauss-Bonnet term (GB) in the bulk. We show that an holographic dark en…
Gravitational Waves from Quasicircular Extreme Mass-Ratio Inspirals as Probes of Scalar-Tensor Theories
Nicolas Yunes, Paolo Pani, Vitor Cardoso
A stellar-mass compact object spiraling into a supermassive black hole, an extreme-mass-ratio inspiral (EMRI), is one of the targets of future gravitational-wave detectors and it o…
Localizing modes of massive fermions and a U(1) gauge field in the inflating baby-skyrmion branes
Térence Delsate, Nobuyuki Sawado
We consider the six dimensional brane world model, where the brane is described by a localized solution to the baby-Skyrme model extending in the extradimensions. The branes have a…
Mimicking dark matter in galaxy clusters through a non-minimal gravitational coupling with matter
Orfeu Bertolami, Pedro Frazão, Jorge Páramos
In this work, one shows that a specific non-minimal coupling between the scalar curvature and matter can mimic the dark matter component of galaxy clusters. For this purpose, one a…
Slowly rotating black holes in alternative theories of gravity
Paolo Pani, Caio F. B. Macedo, Luis C. B. Crispino +1
We present, in closed analytic form, a general stationary, slowly rotating black hole, which is solution to a large class of alternative theories of gravity in four dimensions. In…
Higher-dimensional puncture initial data
Miguel Zilhão, Marcus Ansorg, Vitor Cardoso +4
We calculate puncture initial data, corresponding to single and binary black holes with linear momenta, which solve the constraint equations of D dimensional vacuum gravity. The da…
On the dynamics of perfect fluids in non-minimally coupled gravity
Orfeu Bertolami, António Martins
In this work we explore the consequences that a non-minimal coupling between geometry and matter can have on the dynamics of perfect fluids. It is argued that the presence of a sta…
Elimination of the spin supplementary condition in the effective field theory approach to the post-Newtonian approximation
Steven Hergt, Jan Steinhoff, Gerhard Schaefer
The present paper addresses open questions regarding the handling of the spin supplementary condition within the effective field theory approach to the post-Newtonian approximation…
A new approach to the Newman-Penrose formalism
Andrea Nerozzi
The Newman-Penrose formalism in transverse tetrads, namely those tetrads where Ψ_1=Ψ_3=0, is studied. In particular it is shown that the equations governing the dynamics within thi…
Probing the Flyby Anomaly with the Galileo Constellation
O. Bertolami, F. Francisco, P. J. S. Gil +1
In the last few years, the so-called flyby anomaly has been widely discussed, but remains still an illusive topic. This is due to the harsh conditions experienced during an Earth f…
Mathisson's helical motions for a spinning particle --- are they unphysical?
L. Filipe O. Costa, Carlos A. R. Herdeiro, José Natário +1
It has been asserted in the literature that Mathisson's helical motions are unphysical, with the argument that their radius can be arbitrarily large. We revisit Mathisson's helical…
Compact stars in alternative theories of gravity. Einstein-Dilaton-Gauss-Bonnet gravity
Paolo Pani, Emanuele Berti, Vitor Cardoso +1
We develop a theoretical framework to study slowly rotating compact stars in a rather general class of alternative theories of gravity, with the ultimate goal of investigating cons…
Floating and sinking: the imprint of massive scalars around rotating black holes
Vitor Cardoso, Sayan Chakrabarti, Paolo Pani +2
We study the coupling of massive scalar fields to matter in orbit around rotating black holes. It is generally expected that orbiting bodies will lose energy in gravitational waves…
Leading-order spin-orbit and spin(1)-spin(2) radiation-reaction Hamiltonians
Han Wang, Jan Steinhoff, Jing Zeng +1
In the present paper, the leading-order post-Newtonian spin-orbit and spin(1)-spin(2) radiation-reaction Hamiltonians are calculated. We utilize the canonical formalism of Arnowitt…
Membrane paradigm and entropy of black holes in the Euclidean action approach
José P. S. Lemos, Oleg B. Zaslavskii
The membrane paradigm approach to black holes fixes in the vicinity of the event horizon a fictitious surface, the stretched horizon, so that the spacetime outside remains unchange…
Gravitational wave generation in loop quantum cosmology
Paulo M. Sá, Alfredo B. Henriques
We calculate the full spectrum, as observed today, of the cosmological gravitational waves generated within a model based on loop quantum cosmology. It is assumed that the universe…
Next-to-next-to-leading order post-Newtonian spin(1)-spin(2) Hamiltonian for self-gravitating binaries
Johannes Hartung, Jan Steinhoff
We present the next-to-next-to-leading order post-Newtonian (PN) spin(1)-spin(2) Hamiltonian for two self-gravitating spinning compact objects. If both objects are rapidly rotating…
Numerical simulations of black-hole binaries and gravitational wave emission
Ulrich Sperhake, Emanuele Berti, Vitor Cardoso
We review recent progress in numerical relativity simulations of black-hole (BH) spacetimes. Following a brief summary of the methods employed in the modeling, we summarize the key…
Spherical linear waves in de Sitter spacetime
Joao L. Costa, Artur Alho, Jose Natario
We apply Christodoulou's framework, developed to study the Einstein-scalar field equations in spherical symmetry, to the linear wave equation in de Sitter spacetime, as a first ste…
Compact stars in Eddington inspired gravity
Paolo Pani, Vitor Cardoso, Terence Delsate
A new, Eddington inspired theory of gravity was recently proposed by Banados and Ferreira. It is equivalent to General Relativity in vacuum, but differs from it inside matter. This…
Testing the Cosmic Censorship Conjecture with point particles: the effect of radiation reaction and the self-force
Enrico Barausse, Vitor Cardoso, Gaurav Khanna
A classical thought-experiment to destroy black holes was envisaged by Wald in 1974: it consists of throwing particles with large angular momentum into an extremal black hole, chec…
OSS (Outer Solar System): A fundamental and planetary physics mission to Neptune, Triton and the Kuiper Belt
Bruno Christophe, Linda J. Spilker, John D. Anderson +46
The present OSS mission continues a long and bright tradition by associating the communities of fundamental physics and planetary sciences in a single mission with ambitious goals…
Extreme black hole simulations: collisions of unequal mass black holes and the point particle limit
Ulrich Sperhake, Vitor Cardoso, Christian D. Ott +2
Numerical relativity has seen incredible progress in the last years, and is being applied with success to a variety of physical phenomena, from gravitational-wave research and rela…