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The black hole superradiance phenomena state that when a scalar waveperturbation is properly scattering off a charged or rotating black hole, theenergy of the reflected scalar wave may be amplified. If this amplificationprocess can occur back and forth through certain confining mechanisms, it willlead to strong instability of the black hole, which is so-called "black holebomb". In this paper, the superradiant stability is investigated for dyonicblack holes in string theory. Although the electric charged black hole instring theory has been proved superrdiantly stable, it is found that the dyonicblack hole is more unstable than an RN black hole due to the magnetic charge.Furthermore, by our analysis of the effective potential outside the eventhorizon, we give the region of the parameter associated with the superradiancestability on dyonic stringly black hole.

Superradiantly stability analysis on dyonic stringly black hole