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
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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
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发表时间:
2005
影响因子:
5.4
通讯作者:
K. Panigrahi
K. Panigrahi
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Yasuaki Hikida;R. R. Nayak;K. Panigrahi

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我们研究 Nappi-Witten 模型中的 D 膜,该模型是基于 (SL(2,) × SU(2))/(U(1) × U(1)) 的计量 WZW 模型。该模型描述了一个四维时空,由具有大爆炸/大挤压奇点的宇宙区域和具有闭合类时曲线的静态区域组成。本文的目的是通过 D 膜探针来研究是否存在与宇宙奇点和闭合类时曲线相关的病理现象。我们首先以群论的方式对 D-膜进行分类,然后检查 DBI 行为以获得关于 D-膜的有效理论。特别是,我们表明 DBI 作用的 D 膜度量不包括奇点,并且即使存在闭合类时曲线,D 膜上的波函数也表现良好。
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