Toshifumi Noumi - String Regge trajectories on de Sitter space скачать в хорошем качестве

Toshifumi Noumi - String Regge trajectories on de Sitter space

In string theory, higher spin Regge states are crucial for UV completion of gravitational scattering. In this talk, I will discuss similarity and difference of the spectrum of such string Regge states on flat space, anti-de Sitter space, and de Sitter space. In particular, I will demonstrate that each Regge trajectory on de Sitter space has a maximal spin due to causality and existence of the cosmological horizon, which could be a potential obstruction for string theory construction of de Sitter space. Further studies along this line would be useful for better understanding of de Sitter space and dS/CFT in the string theory context.