This principle of string theory is a long way from testability but…

Ever since 1997, when Maldacena discovered the AdS/CFT correspondence — a duality between AdS space and a “conformal field theory” describing quantum interactions on that space’s boundary — physicists have sought an analogous description of space-time regions like ours that aren’t bottled up. The only “boundary” of our universe is the infinite future. But the conceptual difficulty of projecting a hologram from quantum particles living in the infinite future has long stymied efforts to describe real space-time holographically.

In the last year, though, three physicists have made progress toward a hologram of de Sitter space. Like the AdS/CFT correspondence, theirs is also a toy model, but some of the principles of its construction may extend to more realistic space-time holograms. There is “tantalizing evidence,” said Xi Dong of the University of California, Santa Barbara, who led the research, that the new model is a piece of “a unified framework for quantum gravity in de Sitter [space].”**Natalie Wolchover**, “How Our Universe Could Emerge as a Hologram” at *Quanta*

Still closer to sci-fi than the classroom, it would seem.

*See also:* Suzan Mazur Talks With Fermilab Associate Craig Hogan At Oscillations About The Current State Of The Hologram Universe

Astrophysicist Niayesh Afshordi Explains The Holograph Universe To Suzan Mazur At Oscillations

and

“Substantial evidence” claimed for universe as a hologram

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