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Turbulent Dynamos in a Collapsing Cloud.

Muhammed Irshad P1, Pallavi Bhat1, Kandaswamy Subramanian2,3

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Magnetic fields in stars and galaxies grow much faster during collapse than in stationary turbulence. This superexponential growth, driven by collapsing turbulent clouds, impacts early star and galaxy formation.

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Area of Science:

  • Astrophysics
  • Plasma Physics
  • Cosmic Magnetism

Background:

  • Magnetic field amplification is key to understanding cosmic magnetization.
  • Turbulent dynamos are the primary mechanism, but their behavior in collapsing environments is poorly understood.
  • Existing knowledge relies on limited numerical experiments.

Purpose of the Study:

  • To investigate small-scale and large-scale dynamo behavior in collapsing turbulent clouds.
  • To develop an analytical framework applicable to evolving systems (collapsing/expanding).
  • To apply standard dynamo theory to dynamic astrophysical environments.

Main Methods:

  • Developed an analytical framework for dynamo theory in evolving systems.
  • Performed numerical simulations using a supercomoving formulation of magnetohydrodynamic equations.
  • Analyzed dynamo action in a collapsing turbulent cloud environment.

Main Results:

  • Demonstrated superexponential growth of magnetic fields in collapsing environments, exceeding standard exponential growth.
  • Identified increasing eddy turnover rate during collapse as the cause of enhanced dynamo growth.
  • Showed that saturated magnetic field strength scales with density beyond flux-freezing predictions.

Conclusions:

  • Established a formal framework for studying magnetic field evolution in collapsing/expanding turbulent plasmas.
  • Magnetic fields may become dynamically relevant much earlier in star and galaxy formation than previously assumed.
  • Findings challenge existing models by showing significantly faster magnetic field amplification in dynamic cosmic environments.