Dear all,

Hideki Maeda - Wednesday 6th June - 4.30pm Maths Room 103

This week the QMUL Relativity and Cosmology seminar will be given by
Hideki Maeda on the topic of "Gauss-Bonnet braneworld redux: A novel
scenario for the bouncing universe". The abstract is below.

The seminar will take place as usual at 4.30pm in the Maths Seminar
Room 103 on the Mile End Campus. See our wiki site at
http://cosrel.maths.qmul.ac.uk for more information.

Best wishes,

Ian

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Dr Ian Huston

Postdoctoral Researcher
Cosmology and Relativity Group
Astronomy Unit, School of Physics and Astronomy
Queen Mary, University of London

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http://ph.qmul.ac.uk/i.huston
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Gauss-Bonnet braneworld redux: A novel scenario for the bouncing universe
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.