18.1k citations
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
47 papers · 2 filters
Braneworlds with field derivative coupling to the Einstein tensor
Masato Minamitsuji
In this paper, we investigate the Randall-Sundrum type braneworld models in the scalar-tensor theory with field derivative coupling to the Einstein tensor. We first formulate the g…
Solutions in the scalar-tensor theory with nonminimal derivative coupling
Masato Minamitsuji
We present black hole type solutions in the scalar-tensor theory with nonminimal derivative coupling to the Einstein tensor. The effects of the nonminimal derivative coupling appea…
Covariant and gauge-invariant linear scalar perturbations in multiple scalar field cosmologies
Artur Alho, Filipe C. Mena
We derive a set of equations monitoring the evolution of covariant and gauge-invariant linear scalar perturbations of Friedman-Lemaître-Robertson-Walker models with multiple intera…
I-Q relation for rapidly rotating neutron stars
Sayan Chakrabarti, Térence Delsate, Norman Gürlebeck +1
We consider a universal relation between moment of inertia and quadrupole moment of arbitrarily fast rotating neutron stars. Recent studies suggest that this relation breaks down f…
Collisions of oppositely charged black holes
Miguel Zilhão, Vitor Cardoso, Carlos Herdeiro +2
The first fully non-linear numerical simulations of colliding charged black holes in D=4 Einstein-Maxwell theory were recently reported arXiv:1205.1063. These collisions were perfo…
Collapse of self-interacting fields in asymptotically flat spacetimes: do self-interactions render Minkowski spacetime unstable?
Hirotada Okawa, Vitor Cardoso, Paolo Pani
The nonlinear instability of anti-de Sitter spacetime has recently been established with the striking result that generic initial data collapses to form black holes. This outcome s…
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 energy spectrum of gravitational waves in a loop quantum cosmological model
Joao Morais, Mariam Bouhmadi-Lopez, Alfredo B. Henriques
We explore the consequences of loop quantum cosmology (inverse-volume corrections) in the spectrum of the gravitational waves using the method of the Bogoliubov coefficients. These…
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…
Polytropic spheres with electric charge: compact stars, the Oppenheimer-Volkoff and Buchdahl limits, and quasiblack holes
José D. V. Arbañil, José P. S. Lemos, Vilson T. Zanchin
We explore a class of compact charged spheres made of a charged perfect fluid with a polytropic equation of state. The charge density is chosen to be proportional to the energy den…
Parametric instability in scalar gravitational fields
T. B. Davies, C. H. -T. Wang, R. Bingham +1
We present a brief review on a new dynamical mechanism for a strong field effect in scalar tensor theory. Starting with a summary of the essential features of the theory and subseq…
Thermodynamics, entropy, and stability of thin shells in 2+1 flat spacetimes
José P. S. Lemos, Gonçalo M. Quinta
The thermodynamic equilibrium states of a static thin ring shell in a (2+1)-dimensional flat spacetime is analyzed. Inside the ring the spacetime is flat, whereas outside it is con…
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…
A consistent scalar-tensor cosmology for inflation, dark energy and the Hubble parameter
C. H. -T. Wang, J. A. Reid, A. St J. Murphy +5
A Friedman cosmology is investigated based on scalar-tensor gravitation with general metric coupling and scalar potential functions. We show that for a broad class of such function…
Theory of intersecting loops on a torus
J. E. Nelson, R. F. Picken
We continue our investigation into intersections of closed paths on a torus, to further our understanding of the commutator algebra of Wilson loop observables in 2+1 quantum gravit…
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…
Solar System constraints to nonminimally coupled gravity
Orfeu Bertolami, Riccardo March, Jorge Páramos
We extend the analysis of Chiba, Smith and Erickcek \cite{CSE} of Solar System constraints on gravity to a class of nonminimally coupled (NMC) theories of gravity. These gen…
Effective action and linear response of compact objects in Newtonian gravity
Sayan Chakrabarti, Térence Delsate, Jan Steinhoff
We apply an effective field theory method for the gravitational interaction of compact stars, developed within the context of general relativity, to Newtonian gravity. In this effe…