Application of string theory to cosmology and black hole physics

德西特空间在宇宙学中起着重要的作用，特别是在描述暴胀的模型中。此外，最近的天文观测表明，我们的宇宙有一个小的，但非零的正宇宙学常数，因此可以再次渐近地近似德西特时空。为了使这个实验事实与我们对引力的微观理论的理解相一致，理解德西特空间如何适应现有的量子引力、弦理论或M理论的基本理论是很重要的。在这个项目中，我们建议详细研究这个问题，并在量子引力和弦理论中找到对德西特时空的一致描述。此外，我们建议研究deSitter空间上的量子引力对黑洞内部结构和曲率奇异性分辨问题的影响。

De Sitter space plays an important role in cosmology, in particular, in models describing inflation. Moreover, recent astronomical observations indicate that our Universe has a small, but non-zero, positive cosmological constant and thus can again be approximated asymptotically by de Sitter space-time. In order to reconcile this experimental fact with our understanding of the microscopic theory of gravity it is therefore important to understand how de Sitter space fits in the existing fundamental theories of quantum gravity, string theory or M-theory. In this project we propose to study this problem in detail and find a consistent description of de Sitter space-time in quantum gravity and string theory. Furthermore, we suggest to investigate the implications of quantum gravity on de Sitter space to the problem of the internal structure of black holes and the resolution of curvature singularities.