Seminarium Teorii Względności i Grawitacji

I shall study particle production in Vaidya-like spacetimes far away from the black hole horizon. I Will begin by presenting a simplified argument for the thermality of Hawking radiation. Next, I shall show how to extend the analysis beyond the near-horizon approximation. We will find slight modifications of the Hawking's results, which have a natural thermodynamic interpretation. A very simple model of backreaction of Hawking quanta onto spacetime geometry will be discussed. Developed techniques allow us to study also low-energy modes, for which the standard WKB approximation is not valid.