Browsing by Author "Dai, WB"

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Induced Einstein-Kalb-Ramond theory and the black hole
(1996-02-15)
Kao, WF
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Dai, WB
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Wang, SY
;
Chyi, TK
;
Lin, SY
A four-dimensional induced Einstein-Kalb-Ramond theory with a conformally coupled Kalb-Ramond term is discussed. It is argued that the Kalb-Ramond field is difficult to interpret as an axion field from a dynamical point of view, and hence tends to be unstable. One can, however, apply Routh's method to extract an effective action for the axion field. It is found that the Kalb-Ramond hair will turn the event horizon into a naked singularity. Such an exact solution is found and analyzed carefully.
Magnetically charged black holes in induced gravity
(1998-10-01)
Dai, WB
;
Kao, WF
;
Wang, SY
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物理研究所
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Institute of Physics
It is shown that the regular SO3 non-abelian spherically symmetric monopole solution does not exist in an induced Einstein-Yang-Mills-Higgs model. It is also shown that Higgs scalar hair cannot exist in the presence of a black hole event horizon in this model. The corresponding global behavior of the gauge field is analyzed in a black hole background. In particular, it is shown that a non-trivial non-abelian monopole solution exists only if the radius of the event horizon is smaller than the characteristic radius of the classical monopole.