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Related Experiment Video

Updated: Dec 24, 2025

Age-dependent Dynamics of Locomotion in Caenorhabditis elegans: A Lyapunov Exponent Analysis
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Legendre-spectral Dyson equation solver with super-exponential convergence.

Xinyang Dong1, Dominika Zgid1, Emanuel Gull1

  • 1Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA.

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A new Legendre-spectral algorithm efficiently solves the Dyson equation for quantum many-body systems. This method improves Green's function storage and precision, enabling accurate calculations for large molecular and solid ab initio problems.

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Area of Science:

  • Quantum many-body physics
  • Computational chemistry
  • Materials science

Background:

  • Quantum systems in equilibrium use imaginary time Green's function formalism.
  • Large-scale ab initio calculations face challenges in Green's function storage and Dyson equation precision.

Purpose of the Study:

  • To present a novel Legendre-spectral algorithm for solving the Dyson equation.
  • To address storage and precision limitations in quantum many-body calculations.

Main Methods:

  • Formulating the Dyson equation in Legendre coefficient space.
  • Utilizing fast recursive methods for Legendre polynomial convolution.
  • Developing a Dyson equation solver with quadratic scaling.

Main Results:

  • Achieved faster-than-exponential convergence due to Legendre series expansion.
  • Demonstrated quadratic scaling for the Dyson equation solver.
  • Computed the dissociation energy of He2 with 10^-9 Eh accuracy.

Conclusions:

  • The Legendre-spectral algorithm offers an efficient and accurate solution for quantum many-body problems.
  • This method significantly enhances the treatment of large molecular and solid systems.
  • The algorithm provides high precision with a reduced number of expansion coefficients.