Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2005-09-09
JHEP0601:002,2006
Physics
High Energy Physics
High Energy Physics - Theory
15 pages, no figures, harvmac; added discussion on space-time noncommutativity and consequences in cosmology; some conclusions
Scientific paper
10.1088/1126-6708/2006/01/002
We use D-instantons to probe the geometry of Misner universe, and calculate the world volume field theory action, which is of the 1+0 dimensional form and highly non-local. Turning on closed string tachyons, we see from the deformed moduli space of the D-instantons that the spacelike singularity is removed and the region near the singularity becomes a fuzzy cone, where space and time do not commute. When realized cosmologically there can be controllable trans-planckian effects. And the infinite past is now causally connected with the infinite future, thus also providing a model for big crunch/big bang transition. In the spirit of IKKT matrix theory, we propose that the D-instanton action here provides a holographic description for Misner universe and time is generated dynamically. In addition we show that winding string production from the vacua and instability of D-branes have simple uniform interpretations in this second quantized formalism.
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