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arXiv 0808.3306gr-qcastro-phhep-th
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虫洞几何中薄吸积盘的电磁特征

Electromagnetic signatures of thin accretion disks in wormhole geometries

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

摘要:

本文研究了在静态和球对称的虫孔时空中形成薄吸积盘的物质的物理性质和特征。特别地,我们得到了这些奇异几何的时均能流、吸积盘温度和吸积盘的发射谱,并与Schwarzschild解进行了比较。结果表明,更多的能量是从磁盘中发出的虫洞的几何形状比在Schwarzschild潜在的情况下,吸积质量到辐射的转换效率是一个以上的因素的两个更高的虫洞比静态黑洞。在与流量分布相对应的径向温度分布和吸积盘的发射谱ω L(ω)中证实了吸积盘辐射中的这些效应。我们的结论是,具体的签名出现在电磁波谱,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 characteristics of matter forming thin accretion disks in static and spherically symmetric wormhole spacetimes. In particular, the time averaged energy flux, the disk temperature and the emission spectra of the accretion disks are obtained for these exotic geometries, and are compared with the Schwarzschild solution. It is shown that more energy is emitted from the disk in a wormhole geometry than in the case of the Schwarzschild potential and the conversion efficiency of the accreted mass into radiation is more than a factor of two higher for the wormholes than for static black holes. These effects in the disk radiation are confirmed in the radial profiles of temperature corresponding to the flux distributions, and in the emission spectrum ωL(ω) of the accretion disks. We conclude that specific signatures appear in the electromagnetic spectrum, thus leading to the possibility of distinguishing wormhole geometries by using astrophysical observations of the emission spectra from accretion disks.

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