Colliding branes and formation of spacetime singularities in string theory

Details Colliding branes and formation of spacetime singularities in string theory Colliding branes and formation of spacetime singularities in string theory

2008-12-07

arxiv.org/abs/0812.1377v2

JHEP 0904:038,2009

Physics

High Energy Physics

High Energy Physics - Theory

revtex4, 13 figures. Some typos were corrected, and new refereeces added. Final version to appear in JHEP

Scientific paper

10.1088/1126-6708/2009/04/038

Colliding branes without $Z_{2}$ symmetry and the formation of spacetime singularities in string theory are studied. After developing the general formulas to describe such events, we study a particular class of exact solutions first in the 5-dimensional effective theory, and then lift it to the 10-dimensional spacetime. In general, the 5-dimensional spacetime is singular, due to the mutual focus of the two colliding 3-branes. Non-singular cases also exist, but with the price that both of the colliding branes violate all the three energy conditions, weak, dominant, and strong. After lifted to 10 dimensions, we find that the spacetime remains singular, whenever it is singular in the 5-dimensional effective theory. In the cases where no singularities are formed after the collision, we find that the two 8-branes necessarily violate all the energy conditions.

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