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gr-qc2024
A frame-bundle formulation of quantum reference frames: from superposition of perspectives to superposition of geometries
Daniel A. Turolla Vanzella, Jeremy Butterfield
We provide a possible fully geometric formulation of the core idea of quantum reference frames (QRFs) as it has been applied in the context of gravity, freeing its definition from…
gr-qc1999
On the Emergence of Time in Quantum Gravity
C. J. Isham, J. Butterfield
We discuss from a philosophical perspective the way in which the normal concept of time might be said to `emerge' in a quantum theory of gravity. After an introduction, we briefly…