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arXiv 0901.3926gr-qcastro-ph.HEhep-th
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定常轴对称虫孔时空中的薄吸积盘

Thin accretion disks in stationary axisymmetric wormhole spacetimes

Tiberiu Harko, Zoltán Kovács, Francisco S. N. Lobo

摘要:

本文研究了静止轴对称虫孔时空中形成薄吸积盘的物质的物理性质和平衡热辐射发射特性。通过选取不同的虫洞角速度值,建立了薄吸积盘模型,得到了吸积盘的时均能流、盘温度和辐射谱。通过比较旋转虫洞和Kerr黑洞中的质量吸积,证明了在相同的几何质量和吸积率下,虫洞的吸积通量大于旋转黑洞.我们还提出了转换效率的吸积质量到辐射,并表明,旋转虫洞提供了一个更有效的引擎的吸积质量到辐射的转换比克尔黑洞。因此,特定的签名出现在旋转虫洞周围的薄盘的电磁波谱,从而导致区分虫洞的几何形状,通过使用天体物理观测的发射光谱从吸积盘的可能性。

英文摘要:

In this paper, we study the physical properties and the equilibrium thermal radiation emission characteristics of matter forming thin accretion disks in stationary axially symmetric wormhole spacetimes. The thin disk models are constructed by taking different values of the wormhole's angular velocity, and the time averaged energy flux, the disk temperature and the emission spectra of the accretion disks are obtained. Comparing the mass accretion in a rotating wormhole geometry with the one of a Kerr black hole, we verify that the intensity of the flux emerging from the disk surface is greater for wormholes than for rotating black holes with the same geometrical mass and accretion rate. We also present the conversion efficiency of the accreting mass into radiation, and show that the rotating wormholes provide a much more efficient engine for the transformation of the accreting mass into radiation than the Kerr black holes. Therefore specific signatures appear in the electromagnetic spectrum of thin disks around rotating wormholes, thus leading to the possibility of distinguishing wormhole geometries by using astrophysical observations of the emission spectra from accretion disks.

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