QG Seminar

Speaker: Arundhati Goldar (IIT Mandi)

Title: Bulk Reconstruction in De Sitter Spacetime

Abstract:

The bulk reconstruction program involves expressing local bulk fields as nonlocal operators on the boundary. It was initiated in the context of AdS/CFT correspondence. Attempts to extend it to de Sitter have been successful for heavy(principal series) scalar fields. For other fields, the construction ran into issues. In particular, divergences were found to appear for higher spin fields. In this paper, we resolve these issues and obtain boundary representations for scalars of all masses as well as higher spin fields. We trace the origin of the previously discovered divergences and show that the smearing function becomes distributional for certain values of mass, spin and dimension. We also extend the construction from Bunch-Davies vacuum to all α−vacua.