Aether for quantum gravity?! Dittrich says yes!

On the aether approach, we add the clocks to the system, by way of

– Gaussian reference fluids

– (honest) aether)

– dust proposals.

Huggett: Does the aether introduce some parameter? Dittrich: Aether is a bit more subtle, aether is just a vector field that is hypersurface-orthogonal and provides a slicing of the manifold.

Sudarski: does this break Lorentz-invariance? Dittrich seems willing to bite the bullett, although she describes this as a “diffeomorphism-invariant way” to break Lorentz invariance. This blogger, for one, is puzzled!

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