D-branes in a big bang / big crunch universe: Nappi-Witten gauged WZW model
D-branes in a big bang / big crunch universe: Nappi-Witten gauged WZW model
复制标题
大爆炸/大挤压宇宙中的 D 膜:Nappi-Witten 测量的 WZW 模型
DOI:
10.1088/1126-6708/2005/05/018
复制
发表时间:
2005
影响因子:
5.4
通讯作者:
K. Panigrahi
中科院分区:
文献类型:
--
作者:
Yasuaki Hikida;R. R. Nayak;K. Panigrahi
We study D-branes in the Nappi-Witten model, which is a gauged WZW model based on (SL(2,) × SU(2))/(U(1) × 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.
DOI:
10.1017/9781009253161
发表时间:
2023-02
期刊:
--
影响因子:
--
作者:
S. Hawking;G. Ellis
通讯作者:
S. Hawking;G. Ellis