10.9k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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21 papers · 2 filters
The Cauchy problem in hybrid metric-Palatini f(X)-gravity
Salvatore Capozziello, Tiberiu Harko, Francisco S. N. Lobo +2
The well-formulation and the well-posedness of the Cauchy problem is discussed for {\it hybrid metric-Palatini gravity}, a recently proposed modified gravitational theory consistin…
High-Order Fully General-Relativistic Hydrodynamics: new Approaches and Tests
David Radice, Luciano Rezzolla, Filippo Galeazzi
We present a new approach for achieving high-order convergence in fully general-relativistic hydrodynamic simulations. The approach is implemented in WhiskyTHC, a new code that mak…
Adiabatic regularization and particle creation for spin one-half fields
Aitor Landete, Jose Navarro-Salas, Francisco Torrenti
The extension of the adiabatic regularization method to spin- fields requires a self-consistent adiabatic expansion of the field modes. We provide here the details of such exp…
Analytic solution of the algebraic equation associated to the Ricci tensor in extended Palatini gravity
Ginés R. Pérez Teruel
In this work we discuss the exact solution to the algebraic equation associated to the Ricci tensor in the quadratic extension of Palatini gravity. We show that an exact s…
Type D vacuum solutions: a new intrinsic approach
Joan Josep Ferrando, Juan Antonio Sáez
We present a new approach to the intrinsic properties of the type D vacuum solutions based on the invariant symmetries that these spacetimes admit. By using tensorial formalism and…
Galactic rotation curves in hybrid metric-Palatini gravity
Salvatore Capozziello, Tiberiu Harko, Tomi S. Koivisto +2
Generally, the dynamics of test particles around galaxies, as well as the corresponding mass deficit, is explained by postulating the existence of a hypothetical dark matter. In fa…
Beyond second-order convergence in simulations of binary neutron stars in full general-relativity
David Radice, Luciano Rezzolla, Filippo Galeazzi
Despite the recent rapid progress in numerical relativity, a convergence order less than the second has so far plagued codes solving the Einstein-Euler system of equations. We repo…
Implementation of a simplified approach to radiative transfer in general relativity
Filippo Galeazzi, Wolfgang Kastaun, Luciano Rezzolla +1
We describe in detail the implementation of a simplified approach to radiative transfer in general relativity by means of the well-known neutrino leakage scheme (NLS). In particula…
The Transient Gravitational-Wave Sky
Nils Andersson, John Baker, Kris Belczynski +44
Interferometric detectors will very soon give us an unprecedented view of the gravitational-wave sky, and in particular of the explosive and transient Universe. Now is the time to…
Adiabatic regularization for spin-1/2 fields
Aitor Landete, Jose Navarro-Salas, Francisco Torrenti
We extend the adiabatic regularization method to spin-1/2 fields. The ansatz for the adiabatic expansion for fermionic modes differs significantly from the WKB-type template that w…
Hybrid modified gravity unifying local tests, galactic dynamics and late-time cosmic acceleration
Salvatore Capozziello, Tiberiu Harko, Francisco S. N. Lobo +1
The non-equivalence between the metric and Palatini formalisms of gravity is an intriguing feature of these theories. However, in the recently proposed hybrid metric-Palatin…
Instability of black holes in massive gravity
Eugeny Babichev, Alessandro Fabbri
We show that linear perturbations around the simplest black hole solution of massive bi-gravity theories, the bi-Schwarzschild solution, exhibit an unstable mode featuring the Greg…
Prospects for Observing and Localizing Gravitational-Wave Transients with Advanced LIGO, Advanced Virgo and KAGRA
The LIGO Scientific Collaboration, the Virgo Collaboration, the KAGRA Collaboration +1319
We present our current best estimate of the plausible observing scenarios for the Advanced LIGO, Advanced Virgo and KAGRA gravitational-wave detectors over the next several years,…
Intrinsic energy of Lemaître-Tolman-Bondi models and cosmological implications
Ramon Lapiedra, Juan Antonio Morales-Lladosa
Recently, some Lema{\^ı}tre-Tolman-Bondi metrics have been considered as models alternative to the dark energy within the Friedmann-Lema{\^ı}tre-Robertson-Walker universes. The van…
On the convexity of Relativistic Hydrodynamics
José María Ibáñez, Isabel Cordero-Carrión, José María Martí +1
The relativistic hydrodynamic system of equations for a perfect fluid obeying a causal equation of state is hyperbolic (Anile 1989 {\it Relativistic Fluids and Magneto-Fluids} (Cam…
Generalized Einstein-Maxwell field equations in the Palatini formalism
Ginés R. Pérez Teruel
We derive a new set of field equations within the framework of the Palatini formalism.These equations are a natural generalization of the Einstein-Maxwell equations which arise by…
A note on static metrics: the degenerate case
Joan Josep Ferrando, Juan Antonio Sáez
We give the necessary and sufficient conditions for a 3-metric to be the adapted spatial metric of a static vacuum solution. This work accomplishes for the degenerate cases the alr…
Hawking radiation correlations in Bose Einstein condensates using quantum field theory in curved space
Paul R. Anderson, Roberto Balbinot, Alessandro Fabbri +1
The density density correlation function is computed for the Bogoliubov pseudoparticles created in a Bose-Einstein condensate undergoing a black hole flow. On the basis of the grav…
Hawking effect in BECs acoustic white holes
Roberto Balbinot, Alessandro Fabbri, Carlos Mayoral
Bogoliubov pseudoparticle creation in a BEC undergoing a WH like flow is investigated analytically in the case of a one dimensional geometry with stepwise homogeneous regions. Comp…
On the black hole from merging binary neutron stars: how fast can it spin?
Wolfgang Kastaun, Filippo Galeazzi, Daniela Alic +2
The merger of two neutron stars will in general lead to the formation of a torus surrounding a black hole whose rotational energy can be tapped to potentially power a short gamma-r…
An algorithm for computing geometric relative velocities through Fermi and observational coordinates
Vicente J. Bolós
We present a numerical method for computing the \textit{Fermi} and \textit{observational coordinates} of a distant test particle with respect to an observer. We apply this method f…