Volume 382, Number 1, JanuaryIV 2002
|Page(s)||1 - 5|
|Published online||15 January 2002|
Waves and instabilities in an anisotropic universe
Department of Physics, Aristoteleion University of Thessaloniki, 54006 Thessaloniki, Greece
2 Department of Physics, University of Cincinati, Cincinaty, OH 45219, USA
Corresponding author: D. Papadopoulos, firstname.lastname@example.org
Accepted: 18 October 2001
The excitation of low frequency plasma waves in an expanding anisotropic cosmological model that contains a magnetic field frozen into the matter and pointing in the longitudinal direction is discussed. Using the exact equations governing finite-amplitude wave propagation in hydromagnetic media within the framework of the general theory of relativity, we show that a spectrum of magnetized sound waves will be excited and form large-scale “damped oscillations” in the expanding universe. The characteristic frequency of the excited waves is slightly shifted away from the sound frequency and the shift depends on the strength of the primordial magnetic field. This magnetic field dependent shift may have an effect on the acoustic peaks of the CMB.
Key words: relativity / magnetohydrodynamics (MHD) / waves-cosmology: early Universe
© ESO, 2002
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.