Jamie Lendino via ExtremeTech:
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Mathematicians are already familiar with the holographic principle, which the famous physicist Leonard Susskind first proposed. It asserts that a volume of space can be thought of as encoded on a boundary to it — such as an observer-dependent gravitational horizon — and therefore needs one less dimension then it appears to need. By extension, since our universe seems three-dimensional to us, it could actually be a two-dimensional structure that’s overlaid onto an incredibly large cosmic horizon.
Back in 1997, Juan Maldacena first postulated the theory of a holographic universe, saying that gravity arises from thin, vibrating strings that exist in 10 dimensions. Other physicists have been working with the concept since.
“The work culminated in the last decade, and it suggests, remarkably, that all we experience is nothing but a holographic projection of processes taking place on some distant surface that surrounds us,” wrote physicist Brian Greene, from Columbia University, in 2011.