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Magnetic field generation from cosmological perturbations.

Keitaro Takahashi1, Kiyotomo Ichiki, Hiroshi Ohno

  • 1Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.

Physical Review Letters
|October 4, 2005
PubMed
Summary
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This study shows how cosmological perturbations in plasma generate magnetic fields. Electron-photon collisions induce electric currents, creating a magnetic field of approximately 10(-19) G at 10 Mpc during decoupling.

Area of Science:

  • Cosmology
  • Plasma Physics
  • Astrophysics

Background:

  • Cosmological perturbations are key to structure formation.
  • Understanding the origin of the universe's magnetic fields is a major challenge.
  • Previous models often rely on unknown physics or processes.

Purpose of the Study:

  • To investigate the generation of magnetic fields from cosmological perturbations.
  • To analyze the role of plasma interactions in magnetic field generation.
  • To provide a less ambiguous mechanism for seed magnetic field generation.

Main Methods:

  • Modeling the evolution of a three-component plasma (electron, proton, photon).
  • Evaluating the electron-photon collision term up to second order.
  • Calculating induced electric currents and subsequent magnetic field generation.

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Main Results:

  • The electron-photon collision term induces electric currents.
  • These currents generate magnetic fields.
  • The estimated magnetic field amplitude is ~10(-19) G at 10 Mpc comoving scale at decoupling.

Conclusions:

  • Cosmological perturbations in plasma can generate magnetic fields.
  • This mechanism offers a robust alternative to astrophysical and inflationary models.
  • The study presents a framework with fewer ambiguities regarding unknown physics.