Abstract
We argue that smeared brane solutions, where a charged black -brane is smeared uniformly over one of the transverse directions, can have a Gregory-Laflamme–type dynamical instability in the smeared direction even when the solution is locally thermodynamically stable. These thus seem to provide counterexamples to the Gubser-Mitra conjecture, which links local dynamical and thermodynamic stability. By exploiting an ansatz due to Harmark and Obers, which relates charged solutions to neutral ones, we demonstrate the existence of a threshold unstable mode. This provides strong evidence for the existence of a dynamical instability, although we do not demonstrate its existence directly.
- Received 14 May 2004
DOI:https://doi.org/10.1103/PhysRevD.70.064014
©2004 American Physical Society