Abstract
view Abstract Citations (77) References (19) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS On the Origin of Cosmological Magnetic Fields Tajima, T. ; Cable, S. ; Shibata, K. ; Kulsrud, R. M. Abstract The paper shows that a plasma with temperature T sustains fluctuations of electromagnetic fields and particle density even if it is assumed to be in a thermal equilibrium. The level of fluctuations in the plasma for a given wavelength and frequency of electromagnetic fields is rigorously computed by the fluctuation-dissipation theorem. A large zero-frequency peak of electromagnetic fluctuations is discovered. It is shown that the energy contained in this peak is complementary to the energy 'lost' by the plasma cutoff effect. The present computer particle simulation confirms the theory and exhibits a peaking of the magnetic energy spectrum at zero frequency. The level of magnetic fields is significant at the early radiation epoch of the universe. Such magnetic fluctuations provide seed fields for later evolution. Implications of these magnetic fields in the early universe are discussed. Publication: The Astrophysical Journal Pub Date: May 1992 DOI: 10.1086/171281 Bibcode: 1992ApJ...390..309T Keywords: Cosmology; Magnetic Fields; Magnetohydrodynamics; Space Plasmas; Universe; Computational Astrophysics; Computerized Simulation; Energy Spectra; Astrophysics; COSMOLOGY: EARLY UNIVERSE; COSMOLOGY: THEORY; ISM: MAGNETIC FIELDS; MAGNETOHYDRODYNAMICS: MHD full text sources ADS |
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