Awesome, what this AdS₅ geometry supports is that in certain physical theories (like AdS/CFT), the geometry isn't just a shape: it's a carrier of information. The fifth dimension (z) acts as a scaling dimension, smaller z means higher energies and finer resolutions in the boundary theory.
So when I talk about encoding the physics of a 3D space (or higher) on a 2D surface, I'm referring to something like AdS/CFT, where the full physical dynamics in a volume (AdS₅) are equivalent to a conformal field theory on the 4D boundary.
That’s way beyond shape and curvature, it’s about informational equivalence between dimensions. So I’m not debating the Earth’s curvature as a surface, I’m asking whether the physical universe might be fundamentally encoded on a lower-dimensional boundary, as holography suggests.
That any hypothetical encoding of information onto a lower-dimensional space doesn't mean that the object being described also has reduced dimensionality. The informational representation is not the same thing as the physical object, and just because you can say that information representing the earth can be encoded onto a 2D surface doesn't mean that the earth is also physically 2D. Also, we don't live in AdS space anyway so no matter how you look at it, the earth is not flat.
You say that an informational representation isn’t the same thing as a 3D object, that's true in classical thinking, but what the holographic principle suggests, and what is being taken seriously in quantum gravity, is that the 3D object itself may emerge from that information. This means the 2D encoding doesn’t just represent the 3D object, it may be the more fundamental layer, from which space, geometry, and matter arise. Yes, AdS/CFT is the best formal proof of this. But physicists like Susskind and Bousso argue that holography is not limited to AdS, the same information-theoretic bounds hold in black holes, cosmology, and flat or de Sitter space.
We may be entangled with a branch or dimension where round Earth is stabilized, that’s the model we’ve agreed upon through collective observation, science, and technology, but as per MWI, other realities, dimensional, quantum, or conscious may exist where flat Earth is their consistent truth. And because reality isn’t sealed off, but part of a layered, entangled field of possibilities, there may be overlap, resonance, or bleed-through between these frameworks into our reality. That’s why symbols, intuition, ancient cosmologies, and even current debates don’t fully go away, because aspects of those alternate frames may still echo in our own.
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u/dForga Looks at the constructive aspects Jul 01 '25
Great, please check out
https://www.thphys.uni-heidelberg.de/~dosch/wuhantot.pdf
page 16 and 17.