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This lecture by Christiana Pantelidou from University College Dublin (UCD) explores the fascinating phenomenon of transient superradiance in black hole physics. Delve into the complex nature of black hole quasinormal modes, which are governed by non-normal evolution operators that don't form complete and orthogonal bases. Discover how this mathematical property enables linear perturbations around black holes to exhibit large-amplitude growth at finite time, despite eventually decaying asymptotically. The presentation draws compelling parallels between this transient superradiance mechanism and the transition to turbulence observed in Navier-Stokes shear flows, offering insights into non-modal effects in gravitational systems. Presented at the Dublin Institute for Advanced Studies (DIAS), this hour-long talk bridges advanced concepts in theoretical physics and fluid dynamics.
