R.A. Battye (a) and A. Chamblin (b)
(a) Department of Applied Mathematics and Theoretical Physics, Centre for Mathematical Sciences,
University of Cambridge, Wilberforce Road, Cambridge CB3 OWA, U.K.
(b) Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, U.S.A.

We discuss the gross thermodynamical properties of brane-worlds with a focus on the Randall-Sundrum scenarios. We argue that the Gibbons-Hawking effect and the Hawking-Page phase transitions are both realized in these five dimensional brane world models, and hence they may both play a role in early universe cosmology. This could be particularly interesting during an de-Sitter phase associated with cosmic inflation, where thermal effects are responsible for the perturbations created.