Journal of the Korean Physical Society

pISSN 0374-4884 eISSN 1976-8524


General, Mathematical, and Statistical Physics

Published online July 15, 2006    

Copyright © The Korean Physical Society.

Statistical Entropy and Superradiance in (2+1)-Dimensional Acoustic Black Holes

Wontae Kim, Young-Jai Park, Edwin J. Son and Myung Seok Yoon

J. Korean Phys. Soc. 49(1), 15 (2006)


We study the ``draining bathtub'' as an acoustic analogue of a three-dimensional rotating black hole. The rotating fluid near the sonic horizon necessarily gives rise to superradiant modes, which are partially responsible for the thermodynamic quantities in this rotating vortex-like hole. Using the improved brick-wall method, we explicitly calculate the free energy of the system by treating the superradiance carefully and obtain the desired entropy formula