Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2006-11-24
Phys.Rev.D75:103510,2007
Physics
High Energy Physics
High Energy Physics - Theory
29 pp, 4 figs; Appendix B revised to include junction condition for scalar
Scientific paper
10.1103/PhysRevD.75.103510
We study the collision of two flat, parallel end-of-the-world branes in heterotic M-theory. By insisting that there is no divergence in the Riemann curvature as the collision approaches, we are able to single out a unique solution possessing the local geometry of (2d compactified Milne)/Z_2 x R_3, times a finite-volume Calabi-Yau manifold in the vicinity of the collision. At a finite time before and after the collision, a second type of singularity appears momentarily on the negative-tension brane, representing its bouncing off a zero of the bulk warp factor. We find this singularity to be remarkably mild and easily regularised. The various different cosmological solutions to heterotic M-theory previously found by other authors are shown to merely represent different portions of a unique flat cosmological solution to heterotic M-theory.
Lehners Jean-Luc
McFadden Paul
Turok Neil
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