Oh i see what you mean. since holography is about AdS and not dS. I think susskind is one of the few people working on dS/CFT but apparently its super hard.

Susskind had some ideas for the holography of FRW. Strominger is usually the one associated with dS/CFT. But this kind of research is more of the form “What would holography for dS look like if it existed?” as opposed to for AdS (and variants thereof) where we have several precise examples, wher...

FWIW I do suspect holography has something to do with the cosmological constant problem. I think one clue comes from an old paper by Cohen, Kaplan, Nelson (https://arxiv.org/abs/hep-th/9803132). You might find it interesting. The idea is that effective field theory put in a box breaks down when you ...