Microwave Background Signals from Tangled Magnetic Fields
Microwave Background Signals from Tangled Magnetic Fields
复制标题
来自纠缠磁场的微波背景信号
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
J. Barrow
中科院分区：
文献类型：
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作者：
K. Subramanian;J. Barrow
An inhomogeneous cosmological magnetic field will create Alfv'en-wave modes that induce a small rotational velocity perturbation on the last scattering surface of the microwave background radiation. The Alfv'en-wave mode survives Silk damping on much smaller scales than the compressional modes. This, in combination with its rotational nature, ensures that there will be no sharp cutoff in anisotropy on arc min scales. We estimate that a magnetic field which redshifts to a present value of $3ifmmode imeselse exttimesfi{}{10}^{ensuremath{-}9}mathrm{G}$ produces temperature anisotropies at the $10ensuremath{mu}mathrm{K}$ level at and below 10 arc min scales. A tangled magnetic field, which is large enough to influence the formation of large scale structure, is therefore potentially detectable by future observations.
