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School of Physics and Astronomy

Gauss-Bonnet braneworld redux: A novel scenario for the bouncing universe

6 June 2012

Time: 4:30pm
Venue: Maths 103

The London Relativity and Cosmology Seminar
Hideki Maeda

We propose a new scenario for the bouncing universe in a simple five-dimensional braneworld model in the framework of Einstein-Gauss-Bonnet gravity, which works even with ordinary matter on the brane. In this scenario, the so-called branch singularity located at a finite physical radius in the bulk spacetime plays an essential role. We show that a three-brane moving in the bulk may reach and safely pass through it in spite that it is a curvature singularity. From the bulk point of view, this process is the collision of the three-brane with the shell of branch singularity. From the point of view on the brane, this process is a sudden transition from the collapsing phase to the expanding phase of the universe. This opens a completely new possibility to achieve the bouncing brane universe as a higher-curvature effect.