Speaker
Description
While the cosmological wavefunction has received much attention over the years, being the object dual to CFT correlators in attempts at constructing a dS/CFT correspondence, the in-in correlator has several nice properties which render it in some sense "simpler" — despite being constructed from the wavefunction. In this talk, I will discuss how in-in correlators can be directly obtained from flat-space amplitudes for theories of conformally coupled and massless scalars. The so-called "dressing rules" which permit this uplifting involve attaching auxiliary propagators to flat-space diagrams to effectively soak up the energy which is no longer conserved in de Sitter. This representation also provides a way to study the analytical properties of the in-in correlators by endowing cuts with respect to external variables in momentum space with a natural diagrammatic interpretation, leading to some relations which may be useful for bootstrapping correlators.