In some simple models of a quantum universe, a phenomenon that looks like gravity emerges spontaneously from the mere existence of entanglement. Physicist Juan Maldacena has shown that a model of an entangled quantum universe with only two dimensions of space and lacking any force of gravity at all mimics the same kind of physics seen in a three-dimensional model of an ‘empty’ universe filled with the kind of spacetime fabric necessary for a general-relativistic description of gravity. That’s a mouthful, but what it amounts to is that taking away entanglement in the 2D model is equivalent to
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Holographic universe
