106 citations · 642 across the 22 of their papers we have counts for
22 papers
Approximating General Relativity in Core-Collapse Supernova Simulations
Steven A. Fromm, Vassilios Mewes, O. E. Bronson Messer +3
We present formulations of effective potentials suitable for approximating general relativistic effects in Newtonian simulations of core-collapse supernovae. Assuming a spherically…
thornado+Flash-X: A Hybrid DG-IMEX and Finite-Volume Framework for Neutrino-Radiation Hydrodynamics in Core-Collapse Supernovae
Eirik Endeve, Vassilios Mewes, J. Austin Harris +15
We present neutrino-transport algorithms implemented in the toolkit for high-order neutrino-radiation hydrodynamics (thornado) and their coupling to self-gravitating hydrodynamics…
Relativistic gas accretion onto supermassive black Hole binaries from inspiral through merger
Lorenzo Ennoggi, Manuela Campanelli, Yosef Zlochower +8
Accreting supermassive black hole binaries are powerful multimessenger sources emitting both gravitational and EM radiation. Understanding the accretion dynamics of these systems a…
Ameliorating the Courant-Friedrichs-Lewy condition in spherical coordinates: A double FFT filter method for general relativistic MHD in dynamical spacetimes
Liwei Ji, Vassilios Mewes, Yosef Zlochower +5
Numerical simulations of merging compact objects and their remnants form the theoretical foundation for gravitational wave and multi-messenger astronomy. While Cartesian-coordinate…
Three-dimensional dynamics of strongly twisted magnetar magnetospheres: Kinking flux tubes and global eruptions
J. F. Mahlmann, A. A. Philippov, V. Mewes +3
The origins of the various outbursts of hard X-rays from magnetars (highly magnetized neutron stars) are still unknown. We identify instabilities in relativistic magnetospheres tha…
Handing off the outcome of binary neutron star mergers for accurate and long-term post-merger simulations
Federico G. Lopez Armengol, Zachariah B. Etienne, Scott C. Noble +20
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 remnan…
Circumbinary Disk Accretion into Spinning Black Hole Binaries
Federico G. Lopez Armengol, Luciano Combi, Manuela Campanelli +6
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…
Computational General Relativistic Force-Free Electrodynamics: II. Characterization of Numerical Diffusivity
J. F. Mahlmann, M. A. Aloy, V. Mewes +1
Scientific codes are an indispensable link between theory and experiment; in (astro-)plasma physics, such numerical tools are one window into the universe's most extreme flows of e…
Computational General Relativistic Force-Free Electrodynamics: I. Multi-Coordinate Implementation and Testing
J. F. Mahlmann, M. A. Aloy, V. Mewes +1
General relativistic force-free electrodynamics is one possible plasma-limit employed to analyze energetic outflows in which strong magnetic fields are dominant over all inertial p…
Spontaneous creation of circularly polarized photons in chiral astrophysical systems
Adrian del Rio, Nicolas Sanchis-Gual, Vassilios Mewes +3
This work establishes a relation between chiral anomalies in curved spacetimes and the radiative content of the gravitational field. In particular, we show that a flux of circularl…
Numerical relativity in spherical coordinates: A new dynamical spacetime and general relativistic MHD evolution framework for the Einstein Toolkit
Vassilios Mewes, Yosef Zlochower, Manuela Campanelli +4
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 relativ…
PatchworkWave: A Multipatch Infrastructure for Multiphysics/Multiscale/Multiframe/Multimethod Simulations at Arbitrary Order
Dennis B. Bowen, Mark Avara, Vassilios Mewes +6
We present an extension of the PatchworkMHD code [1], itself an MHD-capable extension of the Patchwork code [2], for which several algorithms presented here were co-developed. Its…
Quasi-Periodicity of Supermassive Binary Black Hole Accretion Approaching Merger
Dennis B. Bowen, Vassilios Mewes, Scott C. Noble +3
In this paper we continue the first ever study of magnetized mini-disks coupled to circumbinary accretion in a supermassive binary black hole (SMBBH) approaching merger reported in…
Electromagnetic Emission from Supermassive Binary Black Holes Approaching Merger
Stéphane d'Ascoli, Scott C. Noble, Dennis B. Bowen +3
We present the first fully relativistic prediction of the electromagnetic emission from the surrounding gas of a supermassive binary black hole system approaching merger. Using a r…
Numerical relativity in spherical coordinates with the Einstein Toolkit
Vassilios Mewes, Yosef Zlochower, Manuela Campanelli +3
Numerical relativity codes that do not make assumptions on spatial symmetries most commonly adopt Cartesian coordinates. While these coordinates have many attractive features, sphe…
Quasi-Periodic Behavior of Mini-Disks in Binary Black Holes Approaching Merger
Dennis B. Bowen, Vassilios Mewes, Manuela Campanelli +3
We present the first magnetohydrodynamic simulation in which a circumbinary disk around a relativistic binary black hole feeds mass to individual accretion disks ("mini-disks") aro…
Relativistic Dynamics and Mass Exchange in Binary Black Hole Mini-Disks
Dennis B. Bowen, Manuela Campanelli, Julian H. Krolik +2
We present the first exploration of relativistic gas dynamics in the immediate vicinity of binary black holes as the system inspirals close to merger in the gravitational radiation…
On the equivalence between the Scheduled Relaxation Jacobi method and Richardson's non-stationary method
J. E. Adsuara, I. Cordero-Carrión, P. Cerdá-Durán +2
The Scheduled Relaxation Jacobi (SRJ) method is an extension of the classical Jacobi iterative method to solve linear systems of equations () associated with elliptic problem…
On the dynamics of tilted black hole-torus systems
Vassilios Mewes, Filippo Galeazzi, José A. Font +2
We present results from three-dimensional, numerical relativity simulations of a {\it tilted} black hole-thick accretion disc system. The simulations are analysed using tracer part…
Quasistationary solutions of self-gravitating scalar fields around collapsing stars
Nicolas Sanchis-Gual, Juan Carlos Degollado, Pedro J. Montero +2
Recent work has shown that scalar fields around black holes can form long-lived, quasistationary configurations surviving for cosmological timescales. With this requirement, scalar…
Numerical relativity simulations of thick accretion disks around tilted Kerr black holes
Vassilios Mewes, José A. Font, Filippo Galeazzi +2
In this work we present 3D numerical relativity simulations of thick accretion disks around tilted Kerr BH. We investigate the evolution of three different initial disk models with…
Measuring the black hole spin direction in 3D Cartesian numerical relativity simulations
Vassilios Mewes, José A. Font, Pedro J. Montero
We show that the so-called flat-space rotational Killing vector method for measuring the Cartesian components of a black hole spin can be derived from the surface integral of Weinb…