Introduction: Spacetime and Quantum Gravity

The Complex Timeless Emergence of Time in Quantum Gravity

“…All these kinds of emergence should be considered in the case of spacetime in quantum gravity, and time in particular, as we do in the following. Our discussion should be seen in the context of a growing body of work on spacetime emergence in quantum gravity in the philosophy literature [22,23,24,25,26,27,28], in addition of course to the quantum gravity literature.…”

Can we “effectivize” spacetime?

“…If the coupling constants have finite limits as the energy scale tends to infinity, then we say the theory is non-perturbatively renormalizable. 8 Importantly, it turns out that some perturbatively non-renormalizable theories are non-perturbatively renor-malizable (for example, see Braun et al 2011).…”

Abandoning the search of the ultimate truth. Strategy shifts in modern physics

“…Without this remarkable concept the whole of high energy physics would look very much different. The idea of effective (field) theories is naturally associated with the concept of renormalization (Crowther 2016).…”