A cautionary note on cosmological magnetic fields
A cautionary note on cosmological magnetic fields
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关于宇宙磁场的警告
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
UK.
中科院分区：
文献类型：
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作者：
L. Teodoro;D. Diver;M. H. D. O. Physics;Astronomy;G. University;Scotland;UK.
This note is concerned with potentially misleading concepts in the treatment of cosmological magnetic fields by magnetohydrodynamical (MHD) modelling. It is not a criticism of MHD itself but rather a cautionary comment on the validity of its use in cosmology. Now that the relevant cosmological data are greatly improved compared with a few decades ago, and even better data are imminent, it makes sense to revisit original modelling assumptions and examine critically their shortcomings in respect of modern science. Specifically, this Letter argues that ideal MHD is a poor approximation around recombination, since it inherently restricts evolutionary time-scales, and is often misapplied in the existing literature.
