Shengtai Li
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View article: exoALMA. XI. ALMA Observations and Hydrodynamic Models of LkCa 15: Implications for Planetary Mass Companions in the Dust Continuum Cavity
exoALMA. XI. ALMA Observations and Hydrodynamic Models of LkCa 15: Implications for Planetary Mass Companions in the Dust Continuum Cavity Open
In the past decade, the Atacama Large Millimeter/submillimeter Array (ALMA) has revealed a plethora of substructures in the disks surrounding young stars. These substructures have several proposed formation mechanisms, with one leading the…
View article: exoALMA XI: ALMA Observations and Hydrodynamic Models of LkCa 15: Implications for Planetary Mass Companions in the Dust Continuum Cavity
exoALMA XI: ALMA Observations and Hydrodynamic Models of LkCa 15: Implications for Planetary Mass Companions in the Dust Continuum Cavity Open
In the past decade, the Atacama Large Millimeter/submillimeter Array (ALMA) has revealed a plethora of substructures in the disks surrounding young stars. These substructures have several proposed formation mechanisms, with one leading the…
Zonal Flow and Self-regulating Mechanism in a Hydrodynamic Disk Open
This study addresses key aspects of momentum transport in hydrodynamic disks, which is critical for understanding zonal flow generation and turbulence in compressible hydrodynamic disks. We find that nonlinear momentum/density transport le…
QCD Equation of State with Strong Magnetic Fields and Nonzero Baryon Density Open
In this work, we have carried out lattice simulations of $(2+1)$-flavor QCD using highly improved staggered quarks at the physical pion mass on $32^3 \times 8$ and $48^3 \times 12$ lattices, with magnetic field strengths ranging up to 0.8 …
Baryon-Electric Charge Correlations and Chemical Potentials as Probes of Magnetized QCD Open
We present the first lattice QCD results of quadratic fluctuations and correlations of conserved charges in (2+1)-flavor lattice QCD in the presence of a background magnetic field. The simulations were performed using the Highly Improved S…
Baryon-Electric Charge Correlations and Chemical Potentials as Probes of Magnetized QCD Open
We present the first lattice QCD results of quadratic fluctuations and correlations of conserved charges in (2+1)-flavor lattice QCD in the presence of a background magnetic field. The simulations were performed using the Highly Improved S…
QCD Equation of State with Strong Magnetic Fields and Nonzero Baryon Density Open
In this work, we have carried out lattice simulations of $(2+1)$-flavor QCD using highly improved staggered quarks at the physical pion mass on $32^3 \times 8$ and $48^3 \times 12$ lattices, with magnetic field strengths ranging up to 0.8 …
Effects of Dust Coagulation on Streaming Instability Open
Streaming instability (SI) in dust has long been thought to be a promising process in triggering planetesimal formation in the protoplanetary disks (PPDs). In this study, we present the first numerical investigation that models the SI in t…
Spot size measurement of a deuterium–tritium dense plasma focus using neutron radiography Open
Neutron radiography is a technique uniquely suited to applications in nuclear diagnostics, non-destructive testing, and subcritical experiments. The spatial resolution of neutron radiographs is degraded by optical blur in the imaging syste…
Simulations on Head-Tail Radio Galaxies Using Magnetic Tower Model Open
The presentation is a series of slides showing diagrams, equations, and various photographs. In summary, a detailed comparison was carried out between hydrodynamic jet and MHD jet models (the magnetic tower jet, more precisely), in an effo…
A Fast Parallel Simulation Code for Interaction between Proto-Planetary Disk and Embedded Proto-Planets: Implementation for 3D Code Open
We develop a 3D simulation code for interaction between the proto-planetary disk and embedded proto-planets. The protoplanetary disk is treated as a three-dimensional (3D), self-gravitating gas whose motion is described by the locally isot…
Verification of runaway migration in a massive disk Open
Runaway migration of a proto-planet was first proposed and observed by Masset and Papaloizou (2003). The semi-major axis of the proto-planet varies by 50% over just a few tens of orbits when runaway migration happens. More recent work by D…
artemis Open
Astrophysical multifluid radiation hydrodynamics code
Baryon electric charge correlation as a magnetometer of QCD Open
The correlation between net baryon number and electric charge, $χ_{11}^{\rm BQ}$, can serve as a magnetometer of QCD. This is demonstrated by lattice QCD computations using the highly improved staggered quarks with physical pion mass of $M…
3D MHD Simulations for Jet Experiments: DOE INFUSE [Slides] Open
micron-scale pits. Engineered pits divert current density and drive local overheating in a way that can be compared with 3D- MHD simulations. All experiments were executed on the Sandia Mykonos Facility. Facility and diagnostic investments…
Binary Black Hole Formation in AGN disk using Athena++ [Slides] Open
of closeness. For a typical "SMBH+2BH" system, the averaged cumulative number of close encounters (with rp ≲ RH) scales approximately as ∝ t0.5. The minimum encounter separation rp follows a cumulative distribution P(p) ∝ rp for rp « RH. W…
On the importance of three-dimensional modeling for high-energy-density physics experiments Open
Laser-driven cylindrical implosion experiments enable direct measurements of hydrodynamic instability growth in convergent geometries, providing a wealth of validation data in the high-energy-density regime. These experiments are designed …
Hydrodynamical Simulations of Black Hole Binary Formation in AGN Disks Open
We study close encounters between two single black holes (BHs) embedded in an AGN disk using a series of global 2D hydrodynamics simulations. We find that when the disk density is sufficiently high, bound BH binaries can be formed by the c…
Contracting and Expanding Binary Black Holes in 3D Low-mass AGN Disks: The Importance of Separation Open
LIGO/Virgo has detected several binary black hole (BBH) merger events that may have originated in the accretion disks of active galactic nuclei (AGNs). These events require individual black hole masses that fall within the pair instability…
Hydrodynamical Simulations of Black-Hole Binary Formation in AGN Disks Open
We study the close encounters between two single black holes (BHs) embedded in an AGN disk using a series of global 2D hydrodynamics simulations. We find that when the disk density is sufficiently high, bound BH binaries can be formed by t…
Implementation and Results of Extended-MHD Post-processing of xRAGE Simulations Open
Magnetic fields are known to affect the evolution of conducting fluids via the J× B force, where J is the current density and B is the magnetic field. Typically, J× B in high energy density plasmas (HEDP) systems is considered small compar…
Fluctuations of conserved charges in strong magnetic fields from lattice QCD Open
We present the first lattice QCD results of the second order fluctuations of and correlations among net baryon number, electric charge and strangeness in (2+1)-flavor lattice QCD in the presence of a background magnetic field with physical…
3D MHD Simulation for Jet Experiments: DOE INFUSE Open
several other key features. Detailed comparisons between 3D MHD simulations and experimental measurements provide a comprehensive description of the interplay among magnetic force, pressure, and flow effects. In particular, we delineate bo…
Correlated Dirac Eigenvalues and Axial Anomaly in Chiral Symmetric QCD Open
We investigate the Dirac eigenvalue spectrum ($\rho(\lambda,m_l)$) to study the microscopic origin of axial anomaly in high temperature phase of QCD. We propose novel relations between the derivatives ($\partial^n \rho(\lambda,m_l)/\partia…
Faster ablative Kelvin–Helmholtz instability growth in a magnetic field Open
Shear flows along a plasma interface will quickly grow unstable due to the Kelvin–Helmholtz instability. If there is a concurrent temperature gradient across the interface, higher modes are stabilized by the thermal diffusion. These ablati…