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Detection of gravitational waves (GWs) paves the beginning of a new era ofgravitational wave astronomy. Black holes (BHs) in their ringdown phase providethe cleanest signal of emitted GWs that imprint the fundamental nature of BHsunder low energy perturbation. Apart from GWs, any complementary signature ofringing BHs can be of paramount importance. Motivated by this we analyzed thescattering of electromagnetic waves in such a background and demonstrated thatthe absorption cross section of a ringing Schwarzschild BH can be superradiant.Moreover, we have found out that such superradiant phenomena are transient innature with a characteristic time scale equal to the GW oscillation time scale.We further point out that the existing ground-based Low Frequency Array(LOFAR), radio telescopes, may be able to detect such transient signals fromBHs of mass range $M\sim 10^{-1} - 10^{-2} M_{\odot}$, which should necessarilybe of primordial origin. Our present result opens up an intriguing possibilityof observing the black hole merging phenomena through electromagnetic waves.

Superradiant scattering of electromagnetic fields from ringing black holes