Stuttgart 2012 – wissenschaftliches Programm
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SYGP: Symposium Gemeinsame Probleme in Fusions- und astrophysikalischen Plasmen
SYGP 1: Invited Talks
SYGP 1.3: Hauptvortrag
Montag, 12. März 2012, 11:20–11:45, V55.22
The thermal noise of the universe — •Reinhard Schlickeiser1 and Peter H. Yoon2 — 1Institut für Theoretische Physik, Lehrstuhl IV: Weltraum- und Astrophysik, and Research Department Plasmas with Complex Interactions, Ruhr-Universität Bochum, D-44780 Bochum, Germany — 2Institute for Physical Science and Technology, University of Maryland, College Park, MD 20742, USA, and School of Space Research, Kyung Hee University, Yongin-Si, Gyeonggi-Do, 446-701, Korea
Fluctuations occur in all laboratory and space plasmas, including unmagnetized and those in thermal equilibrium, Using the system of the Klimontovich and Maxwell equations for collision-poor unmagnetized plasmas, general expressions for the electromagnetic fluctuation spectra (electromagnetic field, charge and current densities) from uncorrelated plasma particles are derived, which are correct within the theory of special relativity. The general expressions hold for collective and non-collective fluctuations, and for weakly amplified and weakly propagating (including aperiodic) fluctuations. Earlier claimed mathematical divergencies, when calculating the fluctuations from growing modes do not occur.
Probably the most important unmagnetized space plasma is the early intergalactic medium, ionized from the earliest generation of stars at redshift about 20, which transformed the Universe from darkness after recombination to light. We determine the thermal noise of the universe in weakly amplified and aperiodic modes, where the latter might be the source of electromagnetic dark forces.