Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2005-03-19
JHEP 0505 (2005) 018
Physics
High Energy Physics
High Energy Physics - Theory
50 pages, 2 figures, minor changes
Scientific paper
10.1088/1126-6708/2005/05/018
We study D-branes in the Nappi-Witten model, which is a gauged WZW model based on (SL(2,R) x SU(2)) / (U(1) x U(1)). The model describes a four dimensional space-time consisting of cosmological regions with big bang/big crunch singularities and static regions with closed time-like curves. The aim of this paper is to investigate by D-brane probes whether there are pathologies associated with the cosmological singularities and the closed time-like curves. We first classify D-branes in a group theoretical way, and then examine DBI actions for effective theories on the D-branes. In particular, we show that D-brane metric from the DBI action does not include singularities, and wave functions on the D-branes are well behaved even in the presence of closed time-like curves.
Hikida Yasuaki
Nayak Rashmi R.
Panigrahi Kamal L.
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