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arXiv 1409.3663hep-thastro-ph.COgr-qchep-ph
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宇宙磁场的全息束缚

A Holographic Bound on Cosmic Magnetic Fields

Brett McInnes

备注：
16 pages, 2 figures, explicit numerical value given for the bound, improved discussion of implications for superadiabatic amplification, version to appear in Nucl Phys B
发表信息：
Nuclear Physics B 892 (2015) 49-62
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摘要：

大到足以观测的磁场在天体物理学中是普遍存在的，即使在非常大的长度尺度上也是如此。这导致了这样的建议，这些领域是种子在非常早期（暴胀）的时间，并随后扩大了各种过程，包括，例如，发电机效应。许多这样的机制会在暴胀再加热结束时产生极大的磁场，因此在早期宇宙的夸克-胶子等离子体时期也是如此。这样的等离子体有一个众所周知的全息描述的热渐近AdS黑洞。我们表明，全息强加的磁场的强度上限（$\approx \; 3.6 \times 10^{18}\;\; \text{gauss}$在强子化温度）在这些情况下，这是以上，但不是远高于，在某些模型中的宇宙磁成因的预期值。

英文摘要：

Magnetic fields large enough to be observable are ubiquitous in astrophysics, even at extremely large length scales. This has led to the suggestion that such fields are seeded at very early (inflationary) times, and subsequently amplified by various processes involving, for example, dynamo effects. Many such mechanisms give rise to extremely large magnetic fields at the end of inflationary reheating, and therefore also during the quark-gluon plasma epoch of the early universe. Such plasmas have a well-known holographic description in terms of a thermal asymptotically AdS black hole. We show that holography imposes an upper bound on the intensity of magnetic fields ($\approx \; 3.6 \times 10^{18}\;\; \text{gauss}$ at the hadronization temperature) in these circumstances; this is above, but not far above, the values expected in some models of cosmic magnetogenesis.

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