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**These are excerpts and elaborations from my book "The Nature of Consciousness"**

Euclidean Quantum Gravity “Euclidean
Quantum Gravity” is a term that refers to the idea that space and time are
treated as equals, and that spacetime at any point in time is the superposition
of all the possible shapes of spacetime. This model is wildly unstable.
However, the Danish physicist Jan Ambjorn and the German physicist Renate Loll (“Non-perturbative Lorentzian Quantum Gravity, Causality and
Topology Change”, 1998) removed the “Euclidean” clause and introduced the time
arrow in the building blocks (or “simplices”) of spacetime. In that case the
building blocks tend to assemble themselves in the kind of spacetime that we
observe (notably, the four dimensions). Basically, a four-dimensional spacetime
emerges spontaneously through a process of self-organization similar to the one
that yields crystals and many biological systems. The catch is that all
building blocks (simplices) must share the same arrow of time (i.e., causality
must be encoded at the smallest level of organization). The Czech physicist Petr
Horava ("Quantum gravity at a Lifshitz point", 2009) proposed
to solve the contradictions of Quantum Physics and General Relativity by
separating space from time at high energy. Basically, at high energy Einstein’s spacetime would decompose into Newton’s separate dimensions for space and time. The idea is intuitive enough: General Relativity is about
gravitation, which is a low-energy phenomenon, whereas Quantum Physics is about
particles and waves, which are high-energy phenomena. Each one has a preferred
“domain” of competence. Horava’s theory
simply finds a compromise between the two, assuming that one emerges from the
other depending on the level of energy. Back to the beginning of the chapter "The New Physics" | Back to the index of all chapters |