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arXiv 0906.0686hep-th
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穿越介子-轴子黑洞的隧道

Tunneling across dilaton-axion black holes

Tanwi Ghosh, Soumitra SenGupta

摘要:

本文利用Parikh-Wilczek隧穿理论研究了带电粒子和不带电粒子隧穿球对称介子-轴子黑洞视界的行为。这样的黑洞解在基于弦论的模型中具有重要意义。对于不同的介子和轴子与电磁场耦合的选择,我们证明了隧穿几率依赖于黑洞的初熵和终熵之差。我们的结果与其他类黑洞的类似结果一致,进一步证实了Parikh-Wilczek形式主义对理解霍金辐射的有用性。的发射光谱示出同意与一个纯粹的热光谱,只有在领先的顺序。确定了贝肯斯坦-霍金公式中面积-熵关系中比例因子的修正。

英文摘要:

In this work we study both charged and uncharged particles tunneling across the horizon of spherically symmetric dilaton-axion black holes using Parikh-Wilczek tunneling formalism. Such black hole solutions have much significance in string theory based models. For different choices of the dilaton and axion couplings with the electromagnetic field, we show that the tunneling probability depends on the difference between initial and final entropies of the black hole. Our results, which agrees with similar results obtained for other classes of black holes, further confirm the usefulness of Parikh-Wilczek formalism to understand Hawking radiation. The emission spectrum is shown to agree with a purely thermal spectrum only in the leading order. The modification of the proportionality factor in the area-entropy relation in the Bekenstien-Hawking formula has been determined.

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