Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2007-01-25
Phys.Rev.D75:064029,2007; Erratum-ibid.D76:029904,2007
Physics
High Energy Physics
High Energy Physics - Theory
9 pages, no figure, revtext4.cls, with corrections in several expressions!
Scientific paper
10.1103/PhysRevD.75.064029 10.11
Recently, Hawking radiation from a Schwarzschild-type black hole via gravitational anomaly at the horizon has been derived by Robinson and Wilczek. Their result shows that, in order to demand general coordinate covariance at the quantum level to hold in the effective theory, the flux of the energy momentum tensor required to cancel gravitational anomaly at the horizon of the black hole, is exactly equal to that of (1+1)-dimensional blackbody radiation at the Hawking temperature. In this paper, we attempt to apply the analysis to derive Hawking radiation from the event horizons of static, spherically symmetric dilatonic black holes with arbitrarily coupling constant $\alpha$, and that from the rotating Kaluza-Klein $(\alpha = \sqrt{3})$ as well as the Kerr-Sen ($\alpha = 1$) black holes via an anomalous point of view. Our results support Robinson-Wilczek's opinion. In addition, the properties of the obtained physical quantities near the extreme limit are qualitatively discussed.
Cai Xu
Jiang Qing-Quan
Wu Shuang-Qing
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