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Related Experiment Videos

Self-gravity driven instabilities at accelerated interfaces.

Robert M Hueckstaedt1, James H Hunter, Richard V E Lovelace

  • 1Applied Physics Division, Los Alamos National Laboratory, New Mexico, USA.

Annals of the New York Academy of Sciences
|June 28, 2005
PubMed
Summary
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A newly discovered self-gravity interfacial instability (SGI) in the interstellar medium accelerates structure formation. This instability impacts atomic and molecular clouds, influencing star formation even at small scales.

Area of Science:

  • Astrophysics
  • Fluid Dynamics
  • Plasma Physics

Background:

  • Nonlinear hydrodynamic flows are crucial in the interstellar medium (ISM), shaping cosmic structures.
  • Interfacial instabilities, like Rayleigh-Taylor and Kelvin-Helmholtz, drive these flows.
  • Previous research identified the self-gravity interfacial instability (SGI) as a key driver.

Purpose of the Study:

  • To investigate the self-gravity interfacial instability (SGI) under conditions with non-zero self-gravity acceleration at the interface.
  • To build upon existing knowledge of SGI and its role in structure formation within the ISM.

Main Methods:

  • Theoretical analysis of density interface instabilities.
  • Numerical simulations to confirm linear theory predictions.

Related Experiment Videos

  • Examination of SGI's behavior with varying initial conditions.

    • Main Results:

    • The SGI drives rapid growth of interface displacements, comparable to free-fall timescales.
    • The instability's growth rate shows near scale invariance, even for wavelengths below the Jeans length.
    • Simulations confirm theoretical expectations regarding SGI's scale-invariant growth.

    Conclusions:

    • The SGI is a significant factor in the early stages of structure formation in the ISM.
    • Understanding SGI is critical for accurate modeling of star formation initial conditions.
    • Further research on SGI with non-zero initial acceleration is warranted.