Projects | Yihan Wang (王艺涵)

VegasAfterglow

Wed, 01 Jan 2025 00:00:00 +0000

VegasAfterglow is a high-performance computational framework combining C++ efficiency with Python accessibility for gamma-ray burst afterglow modeling.

$ pip install VegasAfterglow
$ python -c "import VegasAfterglow; print('ready')"
ready
┌─────────────────────────────────────────────┐
│ VegasAfterglow │
│ Light curve generation ~ms │
│ MCMC inference ✓ │
│ Forward + reverse shock ✓ │
│ Synchrotron self-Compton ✓ │
│ Structured jets ✓ │
└─────────────────────────────────────────────┘

Key Features:

Generates light curves in milliseconds — enabling rapid MCMC parameter inference
Forward and reverse shock modeling across relativistic and non-relativistic regimes
Synchrotron self-Compton emission
Flexible jet structures with arbitrary viewing angles
Python interface for seamless integration with standard fitting tools

Publication: Wang, Chen & Zhang (2025), JHEAP

SpaceHub

Sat, 01 May 2021 00:00:00 +0000

SpaceHub is a state-of-the-art few-body gravity integration toolkit built in C++. It implements Algorithmic Regularization (AR) and symplectic integrators to handle scenarios that break conventional codes:

$ spacehub --status
┌─────────────────────────────────────────────┐
│ SpaceHub v1.0 │
│ Extreme mass ratios ✓ │
│ High eccentricities ✓ │
│ Close encounters ✓ │
│ Round-off error control ✓ │
│ Long-term integration ✓ │
└─────────────────────────────────────────────┘

Key Features:

Algorithmic Regularization for extreme mass ratios (e.g., SMBH + stellar-mass objects)
Symplectic integrators ensuring time-reversibility
Rigorous round-off error control for long-term orbital evolution
Easy-to-use API designed for community adoption
Applications: SMBH binaries, planetary system evolution, chaotic star clusters

Publication: Wang et al. (2021), MNRAS, 505, 1053

Secular

Wed, 01 Jan 2020 00:00:00 +0000

Secular is a fast solver for hierarchical secular dynamics, designed for studying long-term orbital evolution in triple and quadruple stellar/planetary systems.

$ secular --info
┌─────────────────────────────────────────────┐
│ Secular Dynamics Solver │
│ Hierarchical triples ✓ │
│ Quadruple systems ✓ │
│ Lidov-Kozai oscillations ✓ │
│ Stability analysis ✓ │
│ Highly optimized ✓ │
└─────────────────────────────────────────────┘

Key Features:

Solves orbit-averaged equations of motion for hierarchical systems
Highly optimized for Lidov-Kozai oscillation studies
Long-term stability limit analysis
Applications: triple star systems, planet–binary interactions, compact object mergers