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Hao-Yang Yen

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Research Interests

My research spans statistical physics, celestial mechanics, dynamical systems, and mathematical physics. I study the statistical properties of complex and stochastic dynamical systems (e.g., epidemic and ecological models), and N-body problems in celestial mechanics—stability, symmetry, ergodicity and statistical properties, and phase-transition-like phenomena. I’m also interested in connections between statistical physics and number theory/data science.

  • Stochastic dynamics: spectra, mixing, universality, rare events
  • Celestial mechanics: N-body stability, central configurations, symmetry, ergodicity
  • Bridges: statistical physics × number theory/data science

Current Research Areas

Stochastic Dynamics

Tensor Networks for Classical Stochastic Systems

We investigate why tensor networks—originally for quantum many-body systems—can model classical stochastic dynamics. By clarifying the underlying principles beyond 1D cases, we connect quantum and classical formalisms through operator/spectral viewpoints.

  • Tensor networks
  • Rare events
  • Stochastic processes
  • Many-body
Spectral Theory

Spectra, Phase Transitions & Universality

Stochastic generators expose deep links between spectra and macroscopic behaviors. I study how eigenvalue distributions relate to universality classes in nonequilibrium systems. Currently, I found spectral topology can affect dynamics and phase transitions in turbulence.

  • Generators
  • Turbulence
  • Spectral gap
  • Spectral topology
  • Phase transition and universality
Celestial Mechanics

Central Configurations & Symmetry Breaking

Central configurations yield self-similar N-body motions (homothetic expansion/contraction or rigid rotation). I explore analogies to symmetry breaking in statistical physics and map phase-diagram-like structures for symmetric 5-body configurations.

  • Hamiltonian dynamical systems
  • N-body
  • Symmetry
  • Bifurcation
  • Computer Algebra