2008/12/31 by Andreas Tziolas, Anzhong Wang, Zhong Chao Wu
Physics and Astronomy · #Black Holes and Theoretical Physics #Brane cosmology #Cosmology and Gravitation Theories #Gravitational singularity #Non-critical string theory #Noncommutative and Quantum Gravity Theories #Spacetime #Spacetime symmetries #String (physics) #String field theory #String theory #Symmetry (geometry) #gr-qc #hep-ph #hep-th
paper · pdf · doi:10.1088/1126-6708/2009/04/038
published as JHEP 0904:038,2009 · revtex4, 13 figures. Some typos were corrected, and new refereeces added. Final version to appear in JHEP
arxiv created 2009/03/05 · openalex publication_date 2009/04/08 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Colliding branes without Z2 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.