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Related Experiment Videos

Semiclassical model for the ionic self-diffusion coefficient in white dwarfs.

Jérôme Daligault1, Michael S Murillo

  • 1Theoretical Division, Los Alamos National Laboratory, New Mexico 87545, USA.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|May 21, 2005
PubMed
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Self-diffusion in massive white dwarfs is modeled, accounting for strong ionic coupling and partial degeneracy. Semiclassical corrections reveal enhanced diffusion, particularly at lower coupling strengths, impacting stellar evolution models.

Area of Science:

  • Astrophysics
  • Plasma Physics
  • Stellar Evolution

Background:

  • Massive white dwarfs exhibit extreme conditions with high ionic densities (> 10^29 cm^-3).
  • Ions in these environments are strongly coupled and partially degenerate.
  • Understanding ion transport is crucial for modeling white dwarf interiors.

Purpose of the Study:

  • To develop a simple model for self-diffusion in massive white dwarfs.
  • To incorporate effects of strong coupling and partial degeneracy on ion transport.
  • To investigate the influence of semiclassical corrections on diffusion coefficients.

Main Methods:

  • Utilized the one-component plasma diffusion coefficient.
  • Employed scalings from short-time expansions of velocity autocorrelation and memory functions.

Related Experiment Videos

  • Applied a semiclassical correction to classical dynamics for weakly degenerate ions.

    • Main Results:

    • The model predicts enhanced self-diffusion compared to purely classical calculations.
    • Enhanced diffusion is more pronounced at smaller Coulomb coupling parameters.
    • Semiclassical corrections significantly alter diffusion behavior under extreme conditions.

    Conclusions:

    • The developed model provides insights into ion transport in massive white dwarfs.
    • Partial degeneracy and strong coupling effects enhance self-diffusion.
    • Findings are relevant for refining stellar evolution models of white dwarfs.