- #36
atyy
Science Advisor
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No, AS is central to the discussion - AS is the case where gravity is not emergent.
So diff invariance is *not* background independence in LQG? I thought that was the whole point of LQG.
"Diffeomorphism invariance is the technical implementation of a physical idea, due to Einstein. The idea is a modification of the pre-general-relativistic (pre-GR) notions of space and time. In pre-GR physics, we assume that physical objects can be localized in space and time with respect to a fixed non-dynamical background structure." http://relativity.livingreviews.org/Articles/lrr-2008-5/
So diff invariance is *not* background independence in LQG? I thought that was the whole point of LQG.
"Diffeomorphism invariance is the technical implementation of a physical idea, due to Einstein. The idea is a modification of the pre-general-relativistic (pre-GR) notions of space and time. In pre-GR physics, we assume that physical objects can be localized in space and time with respect to a fixed non-dynamical background structure." http://relativity.livingreviews.org/Articles/lrr-2008-5/
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