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arXiv 1608.00552hep-thgr-qchep-ph
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Einstein-Yang-Mills-Higgs理论中荷磁黑洞对无质量标量波的散射

Scattering of massless scalar waves by magnetically charged black holes in Einstein-Yang-Mills-Higgs theory

Alexander Gußmann

摘要:

具有非交换Yang-Mills-Higgs头发的Einstein-Yang-Mills-Higgs方程的经典黑洞解的存在性(我们也称之为“磁荷黑洞解“)意味着并非所有经典的静止磁荷黑洞都能用它们的渐近特征唯一地描述。事实上,在一定的参数范围内,存在着不同的球对称、无旋和渐近平坦的EYMH方程的经典黑洞解,它们具有相同的ADM质量和磁荷,但在近视界区域的几何结构却有很大的不同.(这些是黑洞解,一方面用Reissner-Nordström度规描述,另一方面用不属于Reissner-Nordström形式的度规描述毛状磁磁引力黑洞解。)人们可以通过探测黑洞的近视界区域来区分具有相同渐近特性但不同近视界几何的黑洞。我们认为,一种方法来探测黑洞的近视界区域,它允许区分磁荷黑洞具有相同的渐近特性,但不同的近视界几何是由经典的波散射。以最小耦合无质量探针标量场被磁荷黑洞散射为例,在无限大的Higgs自耦合常数的极限下,它可以作为具有Higgs三重态和规范群SU(2)的EYMH方程的解得到,我们表明,在这种情况下,对于具有不同近视界几何形状但具有相同渐近特性的磁荷黑洞,散射截面不同。我们特别发现,在截面的特征荣耀峰位于不同的散射角。

英文摘要:

The existence of the classical black hole solutions of the Einstein-Yang-Mills-Higgs equations with non-abelian Yang-Mills-Higgs hair, which we will also refer to as "magnetic monopole black hole solutions", implies that not all classical stationary magnetically charged black holes can be uniquely described by their asymptotic characteristics. In fact, in a certain domain of parameters, there exist different spherically-symmetric, non-rotating and asymptotically-flat classical black hole solutions of the EYMH equations which have the same ADM mass and the same magnetic charge but significantly different geometries in the near-horizon regions. (These are black hole solutions which are described by a Reissner-Nordström metric on the one hand and the hairy magnetic monopole black hole solutions which are described by a metric which is not of Reissner-Nordström form on the other hand.) One can experimentally distinguish such black holes with same asymptotic characteristics but different near-horizon geometries classically by probing the near-horizon regions of the black holes. We argue that one way to probe the near-horizon region of a black hole which allows to distinguish magnetically charged black holes with same asymptotic characteristics but different near-horizon geometries is by classical scattering of waves. Using the example of a minimally-coupled massless probe scalar field scattered by magnetically charged black holes which can be obtained as solutions of the EYMH equations with a Higgs triplett and gauge group SU(2) in the limit of an infinite Higgs self-coupling constant we show how, in this case, the scattering cross sections differ for the magnetically charged black holes with different near-horizon geometries but same asymptotic characteristics. We find in particular that the characteristic glory peaks in the cross sections are located at different scattering angles.

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