37 citations · 82 across the 23 of their papers we have counts for
23 papers
Gravitational waves from core collapse of rotating very-massive stars: 3D numerical relativity computation
Alan Tsz-Lok Lam, Masaru Shibata, Sho Fujibayashi
We numerically study the collapse of rotating, very-massive stellar cores with masses of , , , and into black holes using both axisymmetric and…
Explosions from Rotating Very Massive Star Collapses to Black Holes: Effects of Nuclear Burning
Sho Fujibayashi, Alan Tsz-Lok Lam, Yuichiro Sekiguchi +1
We investigate the collapse of rotating very massive and supermassive stellar cores using numerical relativity simulations including an alpha-chain nuclear reaction network and neu…
Exact Mass Conservation in Binary Neutron Star Merger Simulations
Boris Daszuta, Sebastiano Bernuzzi, Joan Fontbuté +4
A long-standing problem in the simulation of neutron star spacetimes is the treatment of vacuum regions outside the stars. The use of an artificial low-density atmosphere is a comm…
Donutization Inside Neutron Stars: Shell-Localized Scalar Fields
Hao-Jui Kuan, Alan Tsz-Lok Lam, Jacquelyn Noronha-Hostler +1
Heavy scalar fields ( eV) in scalar-tensor gravity are expected to be hidden from neutron-star observations because their Compton wavelength is sub-stellar. We s…
A formation scenario of black hole-envelope systems --viscous hydrodynamics simulation in general relativity--
Alan Tsz Lok Lam, Masaru Shibata, Kenta Hotokezaka +1
By performing a viscous hydrodynamics simulation in general relativity for super-Eddington accretion flows onto massive black holes of mass --, we discuss a fo…
Accretion-powered flares from black hole-disk collisions in galactic nuclei
Joaquin Pelle, Kyohei Kawaguchi, Masaru Shibata +1
Black hole impacts on accretion disks in galactic nuclei can power luminous transients, but predicting their observable signatures is challenging because the post-collision flow is…
Black hole-accretion disk collision in general relativity: Axisymmetric simulations
Alan Tsz-Lok Lam, Masaru Shibata, Kyohei Kawaguchi +1
Motivated by recent discoveries of X-ray quasi-periodic eruptions, we revisit the collision of a black hole and an accretion disk. Assuming that they are orbiting a supermassive bl…
Viscous accretion and ejection from tori around black holes in general relativity
Masaru Shibata, Kyohei Kawaguchi, Alan Tsz-Lok Lam
We systematically perform long-term (millions of Schwarzschild time) axisymmetric viscous hydrodynamics simulations for tori around black holes in general relativity supposing the…
Axisymmetric stability of neutron stars as extreme rotators in massive scalar-tensor theory
Alan Tsz-Lok Lam, Kalin V. Staykov, Hao-Jui Kuan +2
Differentially rotating scalarized neutron stars, mimickers of binary merger remnants, can possess an enormous angular momentum larger than what could possibly be sustained in a ne…
SACRA-2D: New axisymmetric general relativistic hydrodynamics code with fixed mesh refinement
Alan Tsz-Lok Lam, Masaru Shibata
We present \texttt{SACRA-2D}, a new MPI and OpenMP parallelized, fully relativistic hydrodynamics (GRHD) code in dynamical spacetime under axial symmetry with the cartoon method us…
Self-consistent scenario for jet and stellar explosion in collapsar: General relativistic magnetohydrodynamics simulation with dynamo
Masaru Shibata, Sho Fujibayashi, Shinya Wanajo +3
A resistive magnetohydrodynamics simulation with a dynamo term is performed for modeling the collapsar in full general relativity. As an initial condition, a spinning black hole an…
Convective stability analysis of massive neutron stars formed in binary mergers
Yong Gao, Kota Hayashi, Kenta Kiuchi +3
We perform fully general-relativistic hydrodynamics simulations of binary neutron star mergers over post-merger to investigate the dynamics of remnant massive neutron…
Accessing universal relations of binary neutron star waveforms in massive scalar-tensor theory
Alan Tsz-Lok Lam, Yong Gao, Hao-Jui Kuan +3
We investigate how the quasi-universal relations connecting tidal deformability with gravitational waveform characteristics and/or properties of individual neutron stars that were…
Binary neutron star mergers in massive scalar-tensor theory: Properties of post-merger remnants
Alan Tsz-Lok Lam, Hao-Jui Kuan, Masaru Shibata +2
We investigate the properties of post-merger remnants of binary neutron star mergers in the framework of Damour-Esposito-Farese-type scalar-tensor theory of gravity with a massive…
Bridging relativistic jets from black hole scales to long-term electromagnetic radiation distances: A moving-mesh general relativistic hydrodynamics code with the HLLC Riemann solver
Xiaoyi Xie, Alan Tsz-Lok Lam
Relativistic jets accompany the collapse of massive stars, the merger of compact objects, or the accretion of gas in active galactic nuclei. They carry information about the centra…
Outflow energy and black-hole spin evolution in collapsar scenarios
Masaru Shibata, Sho Fujibayashi, Alan Tsz-Lok Lam +2
We explore the collapsar scenario for long gamma-ray bursts by performing axisymmetric neutrino-radiation magnetohydrodynamics simulations in full general relativity for the first…
Supernova-like explosion of massive rotating stars from disks surrounding a black hole
Sho Fujibayashi, Alan Tsz-Lok Lam, Masaru Shibata +1
We perform a new general-relativistic viscous-radiation hydrodynamics simulation for supernova-like explosion associated with stellar core collapse of rotating massive stars to a s…
Binary neutron star mergers in massive scalar-tensor theory: Quasi-equilibrium states and dynamical enhancement of the scalarization
Hao-Jui Kuan, Karim Van Aelst, Alan Tsz-Lok Lam +1
We study quasi-equilibrium sequences of binary neutron stars in the framework of Damour-Esposito-Farese-type scalar-tensor theory of gravity with a massive scalar field, paying par…
General-relativistic radiation transport scheme in Gmunu II: Implementation of novel microphysical library for neutrino radiation -- Weakhub
Harry Ho-Yin Ng, Patrick Chi-Kit Cheong, Alan Tsz-Lok Lam +1
We introduce \texttt{Weakhub}, a novel neutrino microphysics library that provides opacities and kernels beyond conventional interactions used in the literature. This library inclu…
General-relativistic radiation transport scheme in I: Implementation of two-moment based multi-frequency radiative transfer and code tests
Patrick Chi-Kit Cheong, Harry Ho-Yin Ng, Alan Tsz-Lok Lam +1
We present the implementation of two-moment based general-relativistic multi-group radiation transport module in the eneral-relativistic ltigrid $\texttt{n…
Dynamical Scalarization during Neutron Star Mergers in scalar-Gauss-Bonnet Theory
Hao-Jui Kuan, Alan Tsz-Lok Lam, Daniela D. Doneva +3
In certain classes of the scalar-Gauss-Bonnet theory strong spacetime curvature in the vicinity of neutron stars and black holes can spontaneously trigger scalarization in the comp…
Numerical-relativity simulation for tidal disruption of white dwarfs by a supermassive black hole
Alan Tsz Lok Lam, Masaru Shibata, Kenta Kiuchi
We study tidal disruption of white dwarfs in elliptic orbits with the eccenticity of -- by a non-spinning supermassive black hole of mass in…
Gmunu: Paralleled, grid-adaptive, general-relativistic magnetohydrodynamics in curvilinear geometries in dynamical spacetimes
Patrick Chi-Kit Cheong, Alan Tsz-Lok Lam, Harry Ho-Yin Ng +1
We present an update of the General-relativistic multigrid numerical (Gmunu) code, a parallelized, multi-dimensional curvilinear, general relativistic magnetohydrodynamics code wit…