Absorption of planar massless scalar waves by Bardeen regular black holes
Absorption of planar massless scalar waves by Bardeen regular black holes
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DOI：
10.1103/physrevd.90.064001
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发表时间：
2014-08
影响因子：
5
通讯作者：
C. F. Macedo;L. Crispino
中科院分区：
文献类型：
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作者：
C. F. Macedo;L. Crispino
黑洞吸积场是物理学中一个很有兴趣的课题。众所周知，吸积在活动星系核和黑洞演化中起着重要作用。基场的吸积常常与吸收截面的研究有关。到目前为止，基本上所有研究过吸收场的黑洞都存在奇点。然而，即使在广义相对论中，也有可能构造出规则的黑洞：有视界但没有奇点的物体。在过去的几年里，许多物理动机的规则黑洞的解决方案已经提出，要求了解他们的吸收特性。本文研究了平面无质量标量波被Barnesian正则黑洞的吸收。我们比较了Barclay黑洞和Reissner-Nordstrom黑洞的吸收截面，表明对于固定的场频率和归一化黑洞电荷，前者总是有较大的吸收截面.我们还表明，它是可能的一个Barbarian黑洞有相同的高频吸收截面的Reissner-Nordstrom黑洞。我们的研究结果表明，在中高频区域，规则黑洞可以与具有奇异性的黑洞具有兼容的性质，就吸收而言。
Accretion of fields by black holes is a subject of great interest in physics. It is known that accretion plays a fundamental role in active galactic nuclei and in the evolution of black holes. Accretion of fundamental fields is often related to the study of absorption cross section. Basically all black holes for which absorption of fields has been studied so far present singularities. However, even within general relativity, it is possible to construct regular black holes: objects with event horizons but without singularities. Many physically motivated regular black hole solutions have been proposed in the past years, demanding the understanding of their absorption properties. We study the absorption of planar massless scalar waves by Bardeen regular black holes. We compare the absorption cross section of Bardeen and Reissner–Nordstrom black holes, showing that the former always have a bigger absorption cross section for fixed values of the field frequency and of the normalized black hole charge. We also show that it is possible for a Bardeen black hole to have the same high-frequency absorption cross section of a Reissner–Nordstrom black hole. Our results suggest that, in mid-to-high-frequency regimes, regular black holes can have compatible properties with black holes with singularities, as far as absorption is concerned.