A simple model for Jeans instability in the presence of a constant magnetic field
نویسنده
چکیده
Jeans instability is derived for the case of a low density self-gravitating fully ionized gas in the presence of a constant magnetic field. A new Jeans wave number, substantially enhanced by the magnetic field, is established under a suitable symmetry assumption. Nevertheless, from our present knowledge regarding the existence of primeval magnetic fields in the Universe, it appears that they are indeed irrelevant for our understanding of large scale structure formation. Numerical examples are given and analyzed.
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