The vacuum polarization around an axionic stringy black hole

Details The vacuum polarization around an axionic stringy black hole The vacuum polarization around an axionic stringy black hole

1992-07-16

arxiv.org/abs/hep-th/9207059v1

Phys.Lett. B297 (1992) 63-66

Physics

High Energy Physics

High Energy Physics - Theory

7 pages, phyzzx.tex, ROM2F-92-36

Scientific paper

10.1016/0370-2693(92)91070-P

We consider the effect of vacuum polarization around the horizon of a 4 dimensional axionic stringy black hole. In the extreme degenerate limit ($Q_a=M$), the lower limit on the black hole mass for avoiding the polarization of the surrounding medium is $M\gg (10^{-15}\div 10^{-11})m_p$ ($m_p$ is the proton mass), according to the assumed value of the axion mass ($m_a\simeq (10^{-3}\div 10^{-6})~eV$). In this case, there are no upper bounds on the mass due to the absence of the thermal radiation by the black hole. In the nondegenerate (classically unstable) limit ($Q_a

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