Waves and instabilities in an anisotropic universe

Details Waves and instabilities in an anisotropic universe Waves and instabilities in an anisotropic universe

2001-10-19

arxiv.org/abs/astro-ph/0110455v1

Astronomy and Astrophysics

Astrophysics

Astronomy and Astrophysics, in press

Scientific paper

10.1051/0004-6361:20011616

The excitation of low frequency plasma waves in an expanding anisotropic cosmological model which 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 general theory of relativity, we show that a spectrum of magnetized sound waves will be excited and form large scale ``\textit{damped oscillations}'' on 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

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