# Dynamical Surface Gravity in Spherically Symmetric Black Hole Formation

@article{Pielahn2011DynamicalSG, title={Dynamical Surface Gravity in Spherically Symmetric Black Hole Formation}, author={Mathias Pielahn and Gabor Kunstatter and Alex B. Nielsen}, journal={Physical Review D}, year={2011}, volume={84}, pages={104008} }

We study dynamical surface gravity in a general spherically symmetric setting using Painleve´Gullstrand coordinates. Our analysis includes several definitions that have been proposed in the past as well as two new definitions adapted to Painleve´-Gullstrand coordinates. Various properties are considered, including general covariance, value at extremality, locality and static limit. We illustrate with specific examples of ‘‘dirty’’ black holes that even for spacetimes possessing a global…

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