D-brane Anti-brane Annihilation in an Expanding Universe

Details D-brane Anti-brane Annihilation in an Expanding Universe D-brane Anti-brane Annihilation in an Expanding Universe

2003-04-17

arxiv.org/abs/hep-th/0304153v1

JHEP 0312 (2003) 012

Physics

High Energy Physics

High Energy Physics - Theory

36 pages, 2 figures

Scientific paper

10.1088/1126-6708/2003/12/012

The time-varying density of D-branes and anti-D-branes in an expanding universe is calculated. The D-brane anti-brane annihilation rate is shown to be too small to compete with the expansion rate of a FRW type universe and the branes over-close the universe. This brane problem is analogous to the old monopole problem. Interestingly however, it is shown that small dimension D-branes annihilate more slowly than high dimension branes. Hence, an initially brany universe may be filled with only low dimension branes at late times. When combined with an appropriate late inflationary theory this leads to an attractive dynamical way to create a realistic braneworld scenario.

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