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arXiv 0705.0180hep-ph
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强各向异性非阿贝尔等离子体不稳定性

Non-abelian plasma instabilities for strong anisotropy

D. Bodeker, K. Rummukainen

摘要:

利用弱场初始条件数值研究了各向异性SU(2)等离子体中的规范场不稳定性。对于中等各向异性,非阿贝尔效应阻止了不稳定模式的增长。如果我们增加各向异性的增长继续超出非阿贝尔饱和界限。我们发现强有力的迹象表明,持续增长不是由于红外场模式的过饱和,而是由于高动量模式,这是不稳定的弱场极限非常快速的增长。饱和振幅强烈依赖于初始条件。对于强的初始场,我们没有观察到持续的增长。

英文摘要:

We numerically investigate gauge field instabilities in anisotropic SU(2) plasmas using weak field initial conditions. The growth of unstable modes is stopped by non-abelian effects for moderate anisotropy. If we increase the anisotropy the growth continues beyond the non-abelian saturation bound. We find strong indications that the continued growth is not due to over-saturation of infrared field modes, but instead due to very rapid growth of high momentum modes which are not unstable in the weak field limit. The saturation amplitude strongly depends on the initial conditions. For strong initial fields we do not observe the sustained growth.

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