Federico G. Lopez Armengol
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View article: AsterX: a new open-source GPU-accelerated GRMHD code for dynamical spacetimes
AsterX: a new open-source GPU-accelerated GRMHD code for dynamical spacetimes Open
We present AsterX, a novel open-source, modular, GPU-accelerated, fully general relativistic magnetohydrodynamic (GRMHD) code designed for dynamic spacetimes in 3D Cartesian coordinates, and tailored for exascale computing. We utilize bloc…
View article: Ameliorating the Courant-Friedrichs-Lewy condition in spherical coordinates: A double FFT filter method for general relativistic MHD in dynamical spacetimes
Ameliorating the Courant-Friedrichs-Lewy condition in spherical coordinates: A double FFT filter method for general relativistic MHD in dynamical spacetimes Open
Numerical simulations of merging compact objects and their remnants form the theoretical foundation for gravitational wave and multimessenger astronomy. While Cartesian-coordinate-based adaptive mesh refinement is commonly used for simulat…
View article: Ameliorating the Courant-Friedrichs-Lewy condition in spherical coordinates: A double FFT filter method for general relativistic MHD in dynamical spacetimes
Ameliorating the Courant-Friedrichs-Lewy condition in spherical coordinates: A double FFT filter method for general relativistic MHD in dynamical spacetimes Open
Numerical simulations of merging compact objects and their remnants form the theoretical foundation for gravitational wave and multi-messenger astronomy. While Cartesian-coordinate-based adaptive mesh refinement is commonly used for simula…
View article: Addition of tabulated equation of state and neutrino leakage support to illinoisgrmhd
Addition of tabulated equation of state and neutrino leakage support to illinoisgrmhd Open
We have added support for realistic, microphysical, finite-temperature equations of state (EOS) and neutrino physics via a leakage scheme to illinoisgrmhd, an open-source GRMHD code for dynamical spacetimes in the einstein toolkit. These n…
View article: Handing off the outcome of binary neutron star mergers for accurate and long-term postmerger simulations
Handing off the outcome of binary neutron star mergers for accurate and long-term postmerger simulations Open
We perform binary neutron star (BNS) merger simulations in full dynamical general relativity with IllinoisGRMHD, on a Cartesian grid with adaptive-mesh refinement. After the remnant black hole (BH) has become nearly stationary, the evoluti…
View article: Addition of tabulated equation of state and neutrino leakage support to IllinoisGRMHD
Addition of tabulated equation of state and neutrino leakage support to IllinoisGRMHD Open
We have added support for realistic, microphysical, finite-temperature equations of state (EOS) and neutrino physics via a leakage scheme to IllinoisGRMHD, an open-source GRMHD code for dynamical spacetimes in the Einstein Toolkit. These n…
View article: Minidisk Accretion onto Spinning Black Hole Binaries: Quasi-periodicities and Outflows
Minidisk Accretion onto Spinning Black Hole Binaries: Quasi-periodicities and Outflows Open
We perform a full 3D general relativistic magnetohydrodynamical (GRMHD) simulation of an equal-mass, spinning, binary black hole approaching merger, surrounded by a circumbinary disk and with a minidisk around each black hole. For this pur…
View article: Handing off the outcome of binary neutron star mergers for accurate and long-term post-merger simulations
Handing off the outcome of binary neutron star mergers for accurate and long-term post-merger simulations Open
We perform binary neutron star (BNS) merger simulations in full dynamical general relativity with IllinoisGRMHD, on a Cartesian grid with adaptive-mesh refinement. After the remnant black hole has become nearly stationary, the evolution of…
View article: Vela pulsar: single pulses analysis with machine learning techniques
Vela pulsar: single pulses analysis with machine learning techniques Open
We study individual pulses of Vela (PSR B0833−45/J0835−4510) from daily observations of over 3 h (around 120 000 pulses per observation), performed simultaneously with the two radio telescopes at the Argentine Institute of Radioastronomy. …
View article: HARM3D+NUC: A New Method for Simulating the Post-merger Phase of Binary Neutron Star Mergers with GRMHD, Tabulated EOS, and Neutrino Leakage
HARM3D+NUC: A New Method for Simulating the Post-merger Phase of Binary Neutron Star Mergers with GRMHD, Tabulated EOS, and Neutrino Leakage Open
The first binary neutron star merger has already been detected in gravitational waves. The signal was accompanied by an electromagnetic counterpart including a kilonova component powered by the decay of radioactive nuclei, as well as a sho…
View article: Superposed metric for spinning black hole binaries approaching merger
Superposed metric for spinning black hole binaries approaching merger Open
We construct an approximate metric that represents the spacetime of spinning binary black holes (BBH) approaching merger. We build the metric as an analytical superposition of two Kerr metrics in harmonic coordinates, where we transform ea…
View article: Circumbinary Disk Accretion into Spinning Black Hole Binaries
Circumbinary Disk Accretion into Spinning Black Hole Binaries Open
Supermassive black hole binaries are likely to accrete interstellar gas through a circumbinary disk. Shortly before merger, the inner portions of this circumbinary disk are subject to general relativistic effects. To study this regime, we …
View article: PSR J0437-4715: The Argentine Institute of Radioastronomy 2019-2020 Observational Campaign
PSR J0437-4715: The Argentine Institute of Radioastronomy 2019-2020 Observational Campaign Open
We present the first-year data set of high-cadence, long-duration observations of the bright millisecond pulsar J0437-4715 obtained in the Argentine Institute of Radioastronomy (IAR). Using two single-dish 30 m radio antennas, we gather mo…
View article: Numerical relativity in spherical coordinates: A new dynamical spacetime and general relativistic MHD evolution framework for the Einstein Toolkit
Numerical relativity in spherical coordinates: A new dynamical spacetime and general relativistic MHD evolution framework for the Einstein Toolkit Open
We present SphericalNR, a new framework for the publicly available Einstein Toolkit that numerically solves the Einstein field equations coupled to the equations of general relativistic magnetohydrodynamic (GRMHD) in a 3+1 split of spaceti…
View article: SphericalNR: A dynamical spacetime and general relativistic MHD evolution framework in spherical coordinates for the Einstein Toolkit
SphericalNR: A dynamical spacetime and general relativistic MHD evolution framework in spherical coordinates for the Einstein Toolkit Open
We present SphericalNR, a new framework for the publicly available Einstein Toolkit that numerically solves the Einstein field equations coupled to the equations of general relativistic magnetohydrodynamics (GRMHD) in a 3+1 split of spacet…
View article: Upgraded antennas for pulsar observations in the Argentine Institute of Radio astronomy
Upgraded antennas for pulsar observations in the Argentine Institute of Radio astronomy Open
Context. The Argentine Institute of Radio astronomy (IAR) is equipped with two single-dish 30 m radio antennas capable of performing daily observations of pulsars and radio transients in the southern hemisphere at 1.4 GHz. Aims. We aim to …
View article: Accretion disks around black holes in scalar-tensor-vector gravity
Accretion disks around black holes in scalar-tensor-vector gravity Open
Scalar Tensor Vector Gravity (STVG) is an alternative theory of gravitation\nthat has successfully explained the rotation curves of nearby galaxies, the\ndynamics of galactic clusters, and cosmological data without dark matter, but\nhas ha…
View article: Interpretation Misunderstandings about Elementary Quantum Mechanics
Interpretation Misunderstandings about Elementary Quantum Mechanics Open
Quantum Mechanics is a fundamental physical theory about atomic-scale processes. It was built between 1920 and 1940 by the most distinguished physicists of that time. The accordance between the predictions of the theory and experimental re…