Würzburg Seminar on Quantum Field Theory and Gravity

I will discuss the evolution of charged black holes in asymptotically de Sitter spacetime. These black holes evolve towards a thermal equilibrium with the cosmological horizon. At very low temperatures i.e. close to extremality, the semiclassical thermal description of these black holes break down and quantum gravitational effects dominate. Such quantum corrections can be effectively described in terms of boundary Schwarzian modes localized at the edge of the large near-horizon throat of these black holes. I will discuss how this near-horizon effective theory changes the evolution of the black holes. The talk will be based on our recent work: https://arxiv.org/abs/2510.18035.