Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990iaus..140..531t&link_type=abstract
Galactic and Intergalactic Magnetic Fields. Proceedings of the 140th. Symposium of the International Astronomical Union, held in
Astronomy and Astrophysics
Astronomy
Big Bang Cosmology, Electromagnetic Fields, Galactic Evolution, Plasma Equilibrium, Black Body Radiation, Radiation Spectra, Wave Dispersion
Scientific paper
It is shown 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 level of the zero frequency magnetic fields is computed. The theoretical minimum magnetic field strength is also computed, as no turbulence is assumed. The size of the fluctuations is shown. These results are not in contradiction with the conventional black body radiation spectra but its extension, and as such, do not contradict the observed lack of structure in the cosmic microwave background. The level of these is computed. The computer particle simulation shows the support of the theory and in fact 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. Implications of these magnetic fields in the early Universe are discussed.
Cable Samuel
Kulsrud Russell M.
Shibata Kazunari
Tajima Toshiki
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