A five-fluid FLRW minisuperspace model is used to argue that the vacuum fluid, not radiation, dust, strings, or walls, is the best choice of time because it yields near-unity tunneling to a classical universe.
Anderson, The Problem of Time in Quantum Gravity , in Classical and Quantum Gravity: Theory, Analysis and Applications, edited by V.R
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Quantum Cosmology with many fluids and the choice of cosmological time
A five-fluid FLRW minisuperspace model is used to argue that the vacuum fluid, not radiation, dust, strings, or walls, is the best choice of time because it yields near-unity tunneling to a classical universe.