On ekpyrotic brane collisions

Details On ekpyrotic brane collisions On ekpyrotic brane collisions

2001-11-30

arxiv.org/abs/hep-th/0111279v2

Nucl.Phys. B626 (2002) 183-206

Physics

High Energy Physics

High Energy Physics - Theory

29 pages, LaTeX2e. v2: Added a reference, revised comments on quantum and string corrections

Scientific paper

10.1016/S0550-3213(02)00056-1

We derive the five-dimensional metrics which describe a non-singular boundary brane collision in the ekpyrotic scenario in the context of general relativity, taking into account brane tension. We show that the metrics constrain matter created in the collision to have negative energy density or pressure. In particular, the minimal field content of heterotic M-theory leads to negative energy density. We also consider bulk brane-boundary brane collisions and show that the collapse of the fifth dimension is an artifact of the four-dimensional effective theory.

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