In braneworld cosmology the expanding Universe is realized as a brane moving through a warped higher-dimensional spacetime. Like a moving mirror causes the creation of photons out of vacuum fluctuations a moving brane leads to graviton production. I show that, very generically, KK-particles scale like stiff matter with the expansion of the Universe and can therefore not represent dark matter in a warped braneworld. I present results for the production of massless and Kaluza-Klein (KK) gravitons for bouncing branes in five-dimensional Anti de Sitter. We find that for a realistic bounce the back-reaction from the generated gravitons will be most likely relevant.

Université de Genève