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**Prof. Tehani Finch**

Department of Physics & Astronomy, Howard University

Rescheduled to December 8, 3:30 PM

Thirkield Hall (Physics), room 103

**An investigation of transient uncharged spherically symmetric black holes**

Explorations of time-dependent black hole solutions quickly become muddled when standard Schwarzschild coordinates are used, but pleasantly simplify in Painleveâ€™-Gullstrand coordinates. This framework has been used to construct a particular model of temporal evolution of black holes, which has features, such as an asymptotic limit of pure Minkowski space, not enjoyed by the standard collapse models of this type. Moreover, calculations have shown that, contrary to the case of a static horizon, an outside observer can actually see the final disappearance of an in-falling object through the horizon of an evaporating black hole. Joint work along these lines conducted with Prof. James Lindesay will be described in this presentation.

**Refreshments will be served ****at 3:15 pm**