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Holographic Space Time and the Degrees of Freedom of Quantum Gravity
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The Wheeler DeWitt equation implies that gravity is a holographic theory: the degrees of freedom in a bounded region live on its boundary. The covariant entropy principle quantifies this, and can be thought of as a definition of area in terms of the dimension of a Hilbert space. The principle implies that the algebra of operators in a diamond is a subalgebra of the algebra on the conformal boundary. I'll argue that the algebra on the conformal boundary of Minkowski space consists of currents carrying helicity and internal quantum numbers on and through the momentum light-cone dual to the conformal boundary. The Hilbert space is constrained
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